I did not give up on OpenID. This is just too bad that it doesnt work.
Long story short:
- I got a proper SSL certificate for www.preissler.co.uk where my actual OpenID provider is sitting at.
- ModSecurity got in the way, quite nasty.
So. It is working now, seriously, like a dream. All the issues I had with WordPress and Slashdot and others... hang on, actually I have not found any site where it is not working.
Ok. Next stop Yubikey. OTP with PIN.