Maybe not raid matchmaking but how about a board that you can post something that notifies you are looking for a group or maybe shows up by your name and level in the tower like a color or symbol or
something so like for example you would have your level, your Gamertag and then below or above that you could have something like a C or a V, the C meaning crota and the V meaning the vault and then then the color of the letter could mean the difficulty, green being normal, red being hard. And then some other idea for a checkpoint symbol or color. I think that would be better then matchmaking because that's just asking for trouble and could cause problems when your trying to do the not matchmaking version with a group you always do it with.
Please read this I think this will help more.
-
This would be called lobby raid matchmaking. But there wouldn't be any more raid matchmaking trolling than there already is. The future is raid matchmaking, embrace the future, the future is now.