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A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
Original Valyrie 1500 from 1997-2003 used tubeless tires. Valkyrie Rune from 2004-2005. Next generation Valkyrie 1800 from 2014-2015. There is no 2017 Valkyrie.
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.