This is an interesting idea, but I can see some safety issues it creates.
I have a Garmin Inreach Explorer+ device. It has full GPS functionality, but I carry it primarily as a safety device. It's an Irridium device that transmits my position every 10 mins, so people can track me, and if I hit the magic button and hold it for 10 seconds, someone will come rescue me. The safety benefits of this are obvious. Thing is, under the GPS ban, I wouldn't be allowed to carry such a device.
Maybe there needs to be some sort of mechanism where by it's in a sealed tamper evident pouch, that doesn't allow the device to be used as a GPS, without breaking the seal, making it obvious that it's been used...
As for the AUK Orienteering style event, I've pondered this. I really like the TCR style with "these bits are mandatory, work the rest out yourself". I've been trying to work out if it would work for an Audax. The Calendar events I've done in .NL and .BE are I believe mandatory route events, and being GPS based they do tend to wiggle around all over the place down beautiful country lanes. But on the .BE event before xmas, I had to divert from the route for the final 50km, as the back roads were just ice. I cycled down main roads to get back to the finish. The ride organiser seemed entirely fine with this given the conditions, the bruises, and the obvious damage to the bike from crashing on the ice.
With the Dutch events, everyone uses a GPS, to the point that now the route sheet is just a list of villages and distances. On Zwolle Boekelo Zwolle I was surprised to get a proper route sheet, I commented on this to Ivo, who pointed out this was a very old route, hence the older style sheet.
Do any AUK events offer a GPX, but no route sheet?
J