As you know, I am quite fond of Kevin Grahams variants, in particular, Trading Posts and Tax Collector. All the rules have been 'rewritten' to take into account the new expansions and approved by the originator. Easy-peasy implementing and understanding
As to the 'official' variants... they have never appealled to me in the same way as those above, but having a quick look through them, here are some observations:
1. 'The battle for completed cloisters' seems too similar to 'Heretics and Shrines'.
2. 'Cloisters for everyone!' seems similar to the 'Abbey' tile.
3. 'Rebuilding' has possibilities.
4. I have never, ever, played with the Count (It's still in its little box
) so can't comment on the official variants.