I used the dyna beads before and never noticed much difference in tire life. I don't think they will damage your wheels because the beads are forced against the tire. This is a video of the action of the beads in a car tire but it should be about the same with a motorcycle...
My experience with Bell is the size.
I'd advise trying one on before you order it online without previously trying the fit. I ordered my usual size large for a Bell 500 and it was waaay too small.
Good luck with your sale. I had the same thing and tried to sell mine with only 800+ mlies for about 2 months with little interest. My last asking price was 12,900 last October. I finally took it to a local high-end independent dealer on consignment and in less than a week it was sold. I don't...
I saw a local dealer had a close out sale on their website on a '21 base first edition sticker price was right at 23,000 sale priced at 9995.
I missed it by less than an hour. Anyone seeing deals like this?