... my version ;) .
... so to answer a few questions, first, yes the Depth Gauge strap will fit a 43mm Aquis. It is plug and play - simple strap swap like any other Oris strap. Yes, you can procure the strap assembly alone from an AD. From my understanding you can order just the strap without the clasp but I chose to order both and got an extra DLC screw set as part of the deal. Nice to have in case one of the coated screws gets damaged.