I think in the case of moving tasks you could probably construct some kind of macro that'll enclose the task caption in quotes and then append "-totaskXYZ" (the archive folder in your case) and lastly press Alt+Enter, and you can put a custom hotkey on that?
AutoHotKey would ofc be one of the most prevalent solutions, but likely your keyboard already has macro functionality, maybe even focused-window-sensitive ones?
However, just last week I found myself pruning many Star-Marks in my MLO because many of those should've realistically been tagged goals which I recently started incorporating in my workflows, and now I have a Starred TREE view in which I only have my most frequently visited non-task entries listed, like the folder about MLO in general, and whenever I wanna move something I'll just use that view to navigate towards the subfolder the task or note would belong to. Yes it's a little more overhead than a direct hotkey, but it allows fast yet still granular moving and that serves me well.
Hope I could help :)