sorry to hear the RS has been slow on the take up, it looks good in the pics.
If its any consolation , I think many more projects are coming on the market, and prices are coming back to only 1/2 crazy, not full nuts.
Good idea to modify the car back a little, maybe take the old add down if you havent already.
You should be able to find a set of 15" minilights around, there are a few come up on the Escort group.
I dont know if you have seen this group, just for 4x108 wheels, post there alsohttps://www.facebook.com/groups/484938989298066/
I fitted the lower front fibreglass Rally type spoiler as in my avatar, it fitted ok. I think the rear bootlid repros would be ok, but havent seen one fistrhand.
Rims, spoiler, and maybe look at the decals and you might get a different crowd.