How is it too much effort? Have you even investigated it? The team at Blesta have taken lots of input from people and updated the importer to work with WHMCS, the software, 8.x. There are always helpful people on their discord, and during office hours the owner and other staff members are around too.
In my opinion, continuing to use WHMCS, the software, gives WHMCS, the company, the green light to do the same in the future, but next time they might just say that owned licenses are now cancelled, and if you want to continue to use WHMCS, the software, you need to pay monthly!
Same here, our price was only going up a few dollars a month, but I felt that I could not condone the mafia like actions of WHMCS, the company, and so on principle migrated away! It is also a bonus that there are only three files, out of more than 9,000, that are encoded with Ioncube.