I haven’t check relative sizes of A40640 and the ERC needle cutter… but I think it would be neat if you could have common Makita mount for both laser and needle cutter. There is an active thread on a Makita mount for A40640 laser module going on right now… and @robertbu is involved.
I love the A40640 so far. So much so I’ve already ordered 3 of them… one for my daughter’s machine and two for a couple of mine. I’ve posted photos to several threads… couldn’t be happier with it.