While still Alpha, there is a working OpenPGP firmware for 3A-Mini.
Only issue so far that I noticed is that the keys probably need to be regenerated when updating the firmware as the implementation is still subject to change.
However after generating the keys on card, at least for me it works just like any other OpenPGP card.
I’m in the same situtaion with a Nitrokey 3A NFC. I was told it will be months before it gets an OpenPGP interface when I raised the same query last week,
Like you I only bought 1 for evaluation. I really wanted an alternative to the Yubikey (which is an excellent OpenPGP card) but they are both Closed source and based in USA, a bad combination for an encryption product.