MasterPDF Editor is quite good. In the past I found the windows keygen works with linux version. You have to block it from accessing internet though, or it will phone home to verify. This was a while ago I used it, so my info may be slightly out of date. Here’s one way to block it from having internet access, start with this command: bwrap --bind / / --unshare-net masterpdfeditor5

https://code-industry.net/masterpdfeditor/