I have minor conflict between aids and glasses. For some unclear reason I asked for a longer tube so the aid would sit further back instead of the very top of the ear. The objection was that the two mikes would be less effective at picking-out sound from the front. Oh, yeah! But we tried it and I like it better. Getting off that top of the ear may fit the glasses better. (I have several pair so there’s no single answer.)
The tube is $10 retail and $2 wholesale except the audi usually buys an assortment of 100 different bits and just calls it Cost Of Business. If you paid well for the aids and can only use them 3 hours, absolutely you should get to try another size.
“Problem” is my audi’s door is locked (isolating) this month. I got the #3 tube last month and they put it on. Even though I said I could do it. So look close at your Widex, call and discuss. See if they think it works to leave a tube on their doorstep for you to pickup and change, or if you would be likely to mung-up the fitting and be stranded until they can see/feel you again.