I was pretty much in your position and waited until recently to remove CalyxOS. (Master procrastinator here…)
I went for IodéOS and can say that the manual install worked very nicely for me (even with the locked bootloader).
I can also highly recommend the Backup function (Seedvault). Many (although not all) Apps and files were automatically carried over to the new phone.
EDIT: Namely Messaging- (Signal, Threema, Element…), Banking-Apps and (surprisingly) Antennapod did not migrate. So make sure to manually backup these.
The functionality of Iodé is also very similar to Calyx.
I had the same experience with the iodeOS installer, it was pretty straight forward, and by following the steps it went smoothly. I just got a FP3+ from a friend and decided to try an alternative OS, and see how is life without all the bloatware ^^