First of all I'm not sure if I'm opening the thread in the right section, so I'm asking an admin to move it if it's needed.
So this weekend my wife had a bad accident with our beloved 406 sedan 2001 2.2HDi (pre-mux electrics). Short damage list: airbags and dashboard cover, all three radiators, power steering lines, gearbox moved backwards for 3-4 inch (no gear selection possible due to messed-up gear change cables/sticks etc), lots of sensors and other staff smashed: MAF, accelerating sensor, oil level sensor, 2 vacuum valves, battery housing, ECU housing, all sort of hoses broken, air filter housing and linecbroken, both front wings, engine hood, front bumper plus under bumper reinforcement, front grille and metal upper and lower traverse, one foglight and one main light, parts of engine electrical wires and the list goes on. Though the chassis legs seem well, so is the subframe.
The car's value here in Romania before the accident was around 2000Euros, if I scrap it probably I get less than 500Euros since second hand market is already 'crowded'... Taking these into account, investing 1200-1500Euros for reparing it (mainly second hand parts) definetly sound crazy, The problem is that recent local regulation almost bans registering Euro3 Diesel cars (very high taxes - approx 1400Euros for a 2.2HDi 406), so buying a functional car and keeping mine for parts also is not an option (cars already registered like mine are not affected by this new law refering to new resitrations or re-registration (due to owner change) taxes). So no matter how you look at it everybody says I should check for another car; currently old ('99-'04) gasoline cars have very low (100-200Euros) registration taxes. I had a look to '99-'04 Focus MK1 1.8 or 2.0 gasoline engines (high capacity in order to diminish the downgrade feeling (from 2.2 406 HDi sedan to 1.8-2.0 gasoline '99-'04 Focus) in terms of power although torque difference will be huge

Still my first option is to try to repair my current 406 2.2HDi - I love the confort offered at high speeds (quite silent up to 160-170km/h with reasonable consumption) and very stable due to low grounding cleareance plus good handling offered by rear independent suspension... Now some questions for forum colleagues:
1) engine electrical wiring can be easily swaped from one car to another identical one (I suppose the whole car electrics enters the car only to the BSI)?
2) Since I can much easier (adm cheaper) find 'fully-muxed' electrics (post 2002) 406 2.2HDi here in Romania, I'm wondering if the whole wiring needs changing plus ECU&BSI? Or the whole list of engine and car sensors also? Some details here pls?
Thanks a lot.