I was thinking protein, too. I think there are a couple of protein drinks designed for drinking while exercising. These may still be too high in sugar, so experimenting with protein first, and if it seems to be better, it might be worth it to try these out.

Generally speaking, I eat a lot of protein off the bike, and on the bike have really only found on thing that sits well for me. cliff shot blocks. yes, mostly sugar, but I find I need something on any ride that is more than an hour. I tend to fuel lightly once during a window of 30-50 minutes. the blocks say a serving is 3, I usually have 1, sometimes 2. I drink only water as the electrolyte drinks are awful for me. Plain electrolyte drops would be an alternative, and I'd use them if the blocks weren't working.

I hope you find a solution! Your goal is great, but it's no fun to be out there and feeling nauseous! I've been there plenty of times, and it really does take the shine off the experience!

Hugs and butterflies,
~T~