I have previously experienced the problem mentioned by others, whereby without power you cannot open the LH door or the Bonnet.
At the risk of stating the obvious my solution is to change the handle. By changing over from a fat excessively cranked or offset handle to a slim and only marginally cranked one, it is possible to alter the handle so that you can opened the bonnet with the door closed. I thought a few RHD Octavia 3 owners might find this a useful approach so put together this simple crib.

I have a MY16 MK3 OCTAVIA TS110/1.4 A7F which has the MBM OCTAVIA 3 Bonnet Release Handle = 5E2823533 with Mounting Bracket = 6R1823633.

Pic 1

I purchased a LHD Bonnet Release Handle For VW Mk4 Golf Jetta Polo Lupo Bora Touran Caddy
Part Number: 1J2823533CC81; 1J2823533C
£5.57
From:

https://www.ebay.co.uk/itm/LHD-Left-Bonnet-Release-Handle-For-VW-Mk4-Golf-Jetta-Polo-Lupo-Bora-Touran-Caddy/183215328990?fits=Car+Make%3AVW|Model%3AGolf|Plat_Gen%3AMK+IV&hash=item2aa87c0ede:g:ef0AAOSwKGpa8Wc9:rk:1:pf:0

Pic2

 

Pretty simple just remove the existing handle:
Small flat blade screwdriver (at a 15 degree angle at the tip to the left of centre) inserted to the right hand side top of the handle. Place screwdriver in behind locking tab and pivot screwdriver tip to the right back to 0 degree of centre, there by sliding the locking tab to the right until loose. Pull handle away from foot-well panel and off of the cable flap.

 

With door open offer up new handle to existing cable flap and fit without locking tab. Test how far the handle needs to rotate to open bonnet. If the bonnet opens only after turning beyond the limits of the closed door, mark, trim and make good handle to fit. I used some  metal putty to fill the voids exposed in the handle, just for neatness. Refit handle with locking tab. Keep old handle, as reversal is an option.
PIC 3 & 4
Done.

 

That is all you need. However I went on to fashion a hard block from scrap wood to fit tightly between the handle and door, held on with sticky backed Velcro which mimics the original safety function but is easily removed when needed.
PIC 5, 6, 7, 8 & 9
& Dusted.

 

 

That was a lot of work and thought. Why is the  block of wood that strange shape? And can you open the bonnet with it in place? If it is easily removable, then you do not have a positive interlock.

I think I will stick with the standard handle and bend it outwards if I ever have a flat battery.

The strange shape of the block of wood is so that it fits very snugly and will not allow the bonnet to be opened while it is in place with the door closed. The block is securely fixed and wont budge with the door closed without some form of leverage. I was going to go for some exposed tape, but the area is dark and difficult to reach and I decided in the end to go for an easily found finger hole at the top. The finger hole is shaped to guide the finger in behind the block that is excavated behind to allow excellent purchase. Anyway sufficient purchase for me to overcome the resistance of the strong Velcro. Its the best I can do to overcome the inherent design floor of not moving the RHD latch to the RHD side. Having now fitted an upgraded battery and turned off the Stop/Start system, I hope I will never use this in anger. Especially as I now top-up the battery charge when needed, but it does give peace of mind. I fully accept this won't be suitable for everyone/anyone but I thought it at least worth sharing.

This is a nice mod idea. I wonder if an alternative solution would be an LHD drivers door with a lock in it. This is how most manufacturers deal with not moving the bonnet release lever over. It’s a massive oversight on Skoda’s part not to do this.

I initially liked the Idea of a remote controlled popper but decided it wouldn't be secure. My preferred solution was an additional bonnet release cable (Bowen) running to a lockable pull latch somewhere else as this also covers a snapped cable problem. Unfortunately I retired my ancient ARC welder last year on safety grounds, so cannot now make the modifications required.

I like the idea of an additional LHD key lock, especially if it used the same key. Unfortunately (and I can't now find any link) when I looked into it I read somewhere that as it stands the Octavia central locking and alarm system supported either LHD or RHD door key locks but not both. This may not be true, (I might even of imagined it) but I decided to give it a miss. If anyone has this solution I for one would still be interested.

Wow