Central locking.

Love the car - miss central locking - and having to go round and check that passengers have locked their doors - sort of back to the dark ages. Seen stealers price for supply of central locking( INSTANT DIGITALIS PRICE) - have seen price of other kits ,dirt cheap without remote - and not too dear to add remote capacity (oh - i know about the technicalities ) ---but has anyone got any advice on a realistic priced remote central locking system and the other problem ( or a pointer to ) getting the door trims off without doing damage---it's an 04 furby, classic, 1.4 TDI, hatch

EDIT AGAIN.

One other question - is it worth putting in a rear hatch opener, or practical??