Just tried Elisa 22.08.1 from Flathub, as possible abandoned Clementine replacement. One feature lacking is ability to queue few tracks first in playlist. If there's big playlist, and you want to play some few tracks first, you have to reoder track manually. But that would not work if you want player to shuffle *after* these few selected tracks are finished. On Clementine, I can hit Ctr + D to queue tracks within already existing playlist. [1], [2], ... numbers are shown on these tracks, in that way making them play first, ignoring actual track positions in the playlist. After these tracks finish playing in the order selected by Ctrl + D, normal playback continues, which might be using shuffle function.
Unfortunately I think this would be super confusing. There's already a way to change what plays next in the playlist; adding another method on top of that would introduce complexities, bugs, and user confusion that I don't even want to think about. :) I don't think we can implement this proposed feature, sorry.