The problem is that so much of what is circulating is opinion, not fact and a lot of the opinion has a basis only in nonsense. Ethanol attracts water and as such can cause some materials to have issues with swelling. There are lots of sorts of "rubber". It is therefore really important if you want the truth and an objective fact based decision of what fuels to use in what engines to get to the details. The easy way out is the lazy way and just blame E10 for everything and you will find no shortage of people that want to do that. Logically if ethanol is giving problems then E5 is going to be problematic but slightly less so. The shift from 5% to 10% is not going to give rise to a lot of the problems that are being attributed to it.
We have had E5 for a very long time and it is only the increase to 10 that has seen the nonsense start. A simple answer therefore is to stick to an E5 fuel which has a higher octane rating and a lower percentage of ethanol. If that has worked OK up until now it will continue to do so. The higher octane is neither here nor there and works fine. My lawnmower runs on Shell V Power because it is what I buy for the trials bikes and so it is what is in the can so it is what I put in the mower. I am too lazy and disinterested to buy seperate lawmower fuel to save 50p a year.
The majority of people are not even aware that unleaded has changed and just fill the car up like they have for years. As best I can see there is no epidemic of cars failing as a result, in fact there appears to be no issue whatsoever. The doom mongers predictions of the need to replace fule lines and pumps wholesale has not happened. But - of course - plenty of Internet reports of "a mate" who has had a problem.
I find it hard to believe a modern bike like a Vertigo would be manufactured with materials that are incompatible with petrol from a filling station and therefore require specialist fuel that is all but unobtainable anywhere. Such a difficult bike to refuel would be unlikley to find much of a market. I have a few friends that have Vertigo and none of them buy fuel mail order, none use Aspen or other specialist fuels. They all buy at the filling station. My TRS runs on V Power which is E5. The manual says "no ethanol" but it runs on E5 and has done since it was new in 2017, so five years of ethanol have done it no harm.
The Ducati forums were full of cranks and crackpots that predicted the end of the world with E10 and it fooled me enough to research it. Meantime the wife's Monster runs just fine on E10. I don't have a Vertigo but do like them and I am thinking about it as next bike. I am pretty sure it will be OK on the V Power that the TRS runs on. The wife's Beta likes the high octane rating too. Not sure I can actually see a problem here.....