Aftermarket Head Unit Swap Toledo/Rapid

My car is the Toledo with the RNS 315 Admundsen head unit installed, so very much the same as installed in the Rapid.

Having trawled through a few posts for answers  I still haven't found a few of the answers for definite before I go ahead and take the unit out.

Reading my manual it's not clear if these Admundsens were ever coded to the car, will they plug straight back in and work if I want to reinstall the unit at a later date?

When installing the new head unit, may go Kenwood/JVC/Pioneer or an  android unit, unsure ATM, if I get the correct leads will it be just plug and play re steering wheel controls, no coding needed?

I've read may not get a display on the screen for the rear parking sensors but they'll bleep as normal, anyone confirm this? I may go rear view camera too.

And last question will I retain the MFD in the centre dash display, like temp, average  consumption, oil temp etc?

Thanks in advance.

Edited 27 April, 20233 yr by MickA