Very sure you can upgrade your Beta Acc even if it's "OB3 only"--I did (Yeah, shame on me I didn't have an acc before , I know, I wanted to but I haven't been online earlier this year due to difficulties with my former provider...).
Only thing you have to do is to click on the "edit account" within the registration tree and remeber your former login
CU
┌─────────────────────────────┐
┤Barbarus hic ego sum, quia non intellegor ulli!├
└─────────────────────────────┘