Awesome idea

Definitely agree about staying under the radar - the logistics of doing it officially would be horrendous (impossible). But that doesnt mean doing it without a heap of planning and all the backups in place. Kiting cant afford 'incidents' - official or otherwise.
Cars, boat, safety gear & medical backup. Pre-arranged campsites, daily supplies covered, contact nos etc etc. To do it well and make sure it was a positive outcome for all would take some organising.
Absolutely vital to establish a workable no. to be involved. Small group. Enough to make it work on both sides = several vehicles; boat support etc for manageable no. on the water.
Keen to be involved if anyone wants to get serious.
Definitely doable. Definitely awesome.