In reply to 1poundSOCKS:
Most of them are cracked, so I'd rather not try my luck with the other ones :/
The Crusherholds mounting device looks great but the website does say "please check the doorframe is of sound construction" and I'm really not sure about that as I believe it's plasterboard. I've considered the fingerboard on a pull up bar thing but can you really trust those compression pullup bars (I'm super light though: 55kg when wet)?
The Pullupmate mentioned in the other topic is interesting; still looks like mounting a fingerboard on it is a bit of a hassle but I'll keep that option.
The pinch block idea is a good one too; I do wonder if it trains finger strength the same way a fingerboard would? I'm terrible at pinching so it would be good to train that too but I don't need it near as much as crimping hard here in Font...
Thanks for the suggestions so far! Any other ideas?
Edit: What about things like Gripmasters or fingertip pushups, are they useless?
Post edited at 14:22