My MWS bolt on wires have a thick silicon coat over the spokes where they attach to the rim. They were blasted, powder coated and baked and still the silicon stayed on. They haven't lost any pressure since they were fitted and have the advantage that as they are tubeless you can use puncture sealant on them.
My spined wires on the jag just have rim tapes and so have to have tubes. I've had to replace a couple of tubes due to punctures and you can't use puncture sealant on them.
I can't see why you couldn't convert an old set with rim tapes to a silicone sealed set up.
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