Is there any way to apply as beta tester?
Haven't thought of any way yet. We'll need to establish internal test procedures first, which won't be happening before the first pass-produced batch is available to us, and that's not going to be before late March 2023.
We did have trouble finding people for a serious betatest for Keyrah V3 - lots of people who "just wanted to have it", willing to pay, but not willing to dedicate any time. WIth something like Keyrah, I have then reverted to only accepting testers who already have a Keyrah, so I knew that the setup for testing is already there, and the "I want to be first"-portion of wanting to be a tester (but not really having an idea what testing means - especially the writing-bugreports part) is out of the equation. What further limited my search was that I wanted testers to be close - either in Germany or at least in directly-neighbouring countries, so shipping is not too expensive if returning the product is required.
I really have to limit access to Rev.6 68060 CPUs, so expect that not a single unit with such a CPU will go to any tester. Any other conditions - I don't know yet.