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I know personally my interest is increased/decreased when I know the selling price. The V85TT is on my radar as a future bike, but I will probably hold out for the tubeless wheels unless a 2020 came along at a price where I could convert to tubeless wheels and still be in the right value.
For the cost of a tube of silicone caulk/sealant and two bolt in valve stem you can convert them to tubeless. About $18 total.
Mmm. Can you do the sealant and O-rings on the tube valve stem and have the "no leak" of the tube, and the ability to plug and go a screw in the tire?
Are you asking if you can seal the valve stem of the tube to the wheel to be air tight? If so possible but personally I do not like to tighten the "stay nut the top side of the tubes valve stem because if the tire slips on the rim it has a tendency to move the tube. If the valve stem is held rigid it can shear/cut it. If loose it can move a bit. This is certainly a bigger issue with running love pressure but it can be an issue even in higher pressure situations. Most DIY tire installers glop on so much soap that until it dries you could probably get the tire to slip on the rim on you garden tractor.