So, a quick idea for a new lego piece would be a double sided stud plate, much like the 2x2 flat bottom, but with actual studs.
Reference:
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.thingiverse.com%2Fthing%3A828141&psig=AOvVaw3FgQvv_mpOXCFLY1f01wKq&ust=1602954406210000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCICAr9LMuewCFQAAAAAdAAAAABAD
EDIT: So sorry for the super long links. I dragged and dropped images for the legos.
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