to be honest,the bleed valve idea is fine provided once you have the fuelling matched to your boost level,you don't alter it!!

i'd set it so you only see 5 or 6 psi and have it checked over/set up by a good company...

then once you decide on management go all out boost

Fez RST amal valve connects to the points you mentioned (the ports are marked C for compressor housing and W for wastegate from memory)

but they are different to Escort RST/Cossie amal valves.