Pulled out the XJR1300 yesterday, not used since late Sept 21, filled with E10 last 4 fill up's in 21, put in the garage with half a tank. I never do anything to them, other than hook the battery up to an Opimate, you shouldn't have to, just keep the bike correctly serviced. I don't start them every few weeks/months, doing the latter, promotes a lot of crab/starting issues.
It fired up first go run as normal.
If your bike is stuffing starting issues, it's due to other issues. In my experience usually crap in the tank, water getting in at some point in it's life which over time corrodes carb internals or regular warm ups during off road periods.
Good friend of mine lives in France, he's been running his bikes on E10 since 2009 ish, which include a Fazer 600/1000, he did have a FZ1, GSX-Rs 750/1000s, 1000SX. Some aren't used for well over a year, none have suffered any issues with starting or fueling.
E10 is fine for well over 12 months, just more social media/forum myth and scare mongering.