Are there any good non-subscription alternatives?
I use Qoppa PDF Studio - there's two versions: Standard and Pro; I'd go with the latter.
It's cross-platform (Windows, macOS and Linux) and you can activate it on any 2 devices and you can deactivate/transfer the licence as many times as necessary.
They don't have a subscription, it's perpetual (whilst your OS continues to support it) and the features are far more extensive than PDF Expert. I'd argue it's better than Adobe PDF.
I used to use PDF Expert myself until they introduced subscriptions and then forced accounts. Readdle lied about the 'lifetime' in version 2 which clearly wasn't the case. Now, in v3, they say the 'lifetime' gets "limited upgrades" which is slightly more honest (albeit their claim is meaningless without further context).
Didn't PDF Expert used to have templates on macOS (e.g. blueprint, music score, squared paper)? I seem to recall that but I couldn't find it in version 3.0.23.