did a maniac hack on the old lem.el recently, mainly for the 0.19 release. overhauled the logic of all the sorting/listing commands. they should be more rigorous and flexible to update now. various other fixes too. pushed to main, so will hit MELPA soon.
also added unified inbox for replies, mentions, and private messages, and various other minor display improvements.
Nice! Was thinking of doing smtn similar myself. Will definitely play around with this!