i was about to ask are you taking the piss… but maybe we can invent the bike equivalent of the beer mile race.
re generation UCan i tried it for a while sold by the claims but i just didnt find a benefit and found i wanted a gel as well. i did give it a good trial. but went back to what i do for the 70.3 which is cliff chews on the bike, Born PROTEIN PEPTOPRO® RECOVERY on the bike AND 2 nuun in a second bottle (so i get electrolytes, some protein in amino acid form and quick carbs), born banana gels as needed on bike and run, and i have some salt stick chews (top up electrolytes), and dates… i nibble my way through what feels right. i have a target for my carbs requirements also. i am terrible to eat running so i have to be on top of this on the bike. but its what works for me. i dont force food in running… i just take what i need from a gel and sips
people are so individual. whether you prefer some solids on the bike or not is individual BUT if you do, eat them early on the bike and then go onto liquids and gels and chews etc or eat something solid and then return to UCan. you may or may not need additional electrolytes and water. but as you say temperature are cool. so fluid requirements not mega. you must make sure that you meet your salt requirements which are higher than most standard products. hence i chew some extra salt stick chews. i also have tried the precision hydration electrolyte drink but it made me feel like i was on something (VERY weird and i dont know what that was all about but it happened twice and it wasnt good and i wont be doing a froome on it). these are the born products. i like them because of the pepto pro which is easily absorbed and i know the company in holland http://www.born.eu/products.html
i would say that yes you will need something solid on the bike. my boyfriend actually takes a protein drink in T1 and T2 but most people cannot stomach this and this is IM distance. i would say get comfortable on the bike, then have some fluids, then have something a little more solid (small bites of a bar that is formulated for sport) or some jellies or sports chews, or banana or potatoes! then transition on to gels or UCan and keep on gels/UCan/ on course nutrition for the running. add water and electrolytes or sports drink (not at same time as food) as needed and based on your requirements. you are going to have to test this out and see what works for you in training …
PS i totally get the reasoning behind UCan but havent see it play out. sports scientists are very against its claims but i do think for gastro issues it has merit. as regards stable blood glucose levels? in a race we need all that we can get!! unless you are the rare person that has issues with rebound hypo.
hope this helps