if your remote central locking kit is a standard kit you could mount 1 actuator in the drivers door connected to the bar of the door pin.
This way you will activate the original central locking with the remote control of the kit.
AFAIK all Stilos come with remote locking, if you can get a working key from eBay (less than £5) and the immobiliser code from Fiat (£40 IIRC) you can pay a lock specialist (think I paid about £15 or so?) to programme the key to your car and switch the key blades and immobiliser chips, provided everything required on the car works of course. That or pay Fiat something like £200 .
In the UK yes, but op isn't in the UK so it is possible they haven't got rcl.
Ah didn't realise it was UK only !
How do i post the PDF?