I would also like this for my alts… its so hard to even get in low keys or find groups for them to catch up.
Blizzard could make it like you cant join +3 queue if you have not done some keys in +2 and so on on top of the item lvl needed to queue, to maybe guarantee a little bit of experience for joining a + 5 for example.
And it’s not like groups that are formed over the looking for group tool are always full of players that know what to do… Sometimes you see people with 2.5k score or higher and think wtf are they doing and how did they get the score. So i don’t see this as a problem for a group finder for low m+ keys because you always have people that don’t know what to do even in higher keys.