It's the price to play. You'll barely be going thru those 10 gallons in a season. I only planned on getting max 10hrs a season on the bike. Why I went with no ethanol.
That KTM looks so much fun. Do you ride them on track days with sport bikes?
You'll be fine with 91-93 pumps gas with 10%E. I just wouldnt let it sit for long periods of time if not in use. I use VP - T4 97 octane 0%E for my 23 Kx 450. Also tuned for it. Of course 5 gallons is like $100.
Any gas stations nearby with 91 octane no E?