what is the best option for an alternative steering rack i don't fancy my chances of finding a mk1 or 2 escort rack in the local scrappers

i am building a middy by the way

Why not try a Sierra rack?

Cheap and readily available.

why not use a fiesta/escort mk3,mount it on the bulkhead

Most motor factors can get a Mk2 escort rack in 24 hours, they are normally £20 + £20 surcharge