I see what you’re saying.
I think the best thing to do would be to make multi clips, but you may be too far down the road. Keep it mind for next time as multi clips are one clip with all the angles in it.
I think for now, the easiest thing to do would be to compound each Project, edit those compound clips in to a new Project, and then break apart the compound clips in the new Project to give you access to the clips back.
To break apart compound clips, select the clip and choose Clip > Break Apart Items which is also Command-shift-g