Nitrokey Start questions


I’m looking at getting a Nitrokey Start for GPG signing operations on an unattended machine, but I have a few questions:

Does the Start support 4096 bit RSA keys? The store page says yes, but I’ve seen several pages in the documentation claim the opposite.

Is the PIN always needed? The machine in question is headless and I intend to secure it by removing the key when releases aren’t being made, rather than a PIN which doesn’t really add any security seeing as the same code which provides the PIN is making the request anyway.

Is there any ETA on when they will be back in stock?

Thank you