Good post - and good working out too!. (the mods can merge threads, so all of this can be tacked onto the end of lugh's thread).

Anything successfully bribed in Rome can be dropped into the crusade marker before it makes its first move, saving you the maintainance cost straight away. Instant Excom is still the biggest headache, when it comes to stealing Rome.

I checked again and Chapter House is a keep-level building but I forget which other factions start with one. Shouldn't the Tower of London be a keep on turn one? (The English would still need the church built first, though).

Historically, Chapter Houses were monastic-type constructions, out in the back of beyond, not in the heart of big towns. They probably got off the ground using money donated by pilgrims and other benefactors. Their land-holdings earned them rental income, which sustained them thereafter and were not a possession of any king. Personally, I'd mod them to be buildable without any pre-requisites, not even the church. The church trains agents, so the prerequisites for that should be kept as-is.

Even better would be modding the startpos to have a Chapter House ready built for each Catholic faction but remember to also change the prerequisites to nil, because all the see-saw European hostilities have a habit of smashing the infrastructure and stopping them ever being built and/or rebuilt.