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I plan to 3D print a set for my M3P. The latches should be in the trunk to unlock the seats, and not on the seats in the main cabin, so you can secure valuables in the trunk. The 3D printed workaround to secure the trunk seems like a quick and effective solution.
UPDATE 2: As requested, a remix using bolts to assemble https://www.thingiverse.com/thing:3431139 UPDATE: I modified the base piece to allow for side-to-side adjustment during installation (see red printed piece in photo). For my car, the mechanism works best biased towards the driver's side...