your going to have to swap harness's
no, there's no adapter.

swapping harnesses is an option, but you might need to figure out a way to mount the button bracket, the wiring length to the switches on the sys 11 are shorter to the service switches.

Obviously, the outer door will look way different. Any reason you cannot just repaint your original coin door so it stays original to system 11 ?

Here a link to Bryan Kelly's resto video of an MM coindoor, system 11 stamped steel doors get the same "spatter" finish. This weekend I'm repainting my first sys 11 door for an Earthshaker and I just tested out his method on some scrap metal, damned if it doesn't look super close to the real deal.

One addition I might make, courtesy of CosmoKramer, is to chill your gloss black spray paint in the freezer for 15 minutes or so prior to painting the spatter. I found that at room temperature I was getting too fine a spatter pattern, and chilling the paint a bit made the globs a little larger and closer to the original finish.

I’m in the process of swapping over a new WPC coin door into my system 11.

I’m wondering about the slam tilt switch. The old system 11 door incorporates a diode whereas the new wpc type door doesn’t. Do I need to swap the switch over?

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Not sure if it’s absolutely necessary, but I would swap the diode over.