This seems like an awful lot of complication for such an otherwise simply-solved issue. If i'm reading you right, it sounds like you'd only have this additional HM line at the etreme inboard end of the rode; dwouldn't that mean having to lay out the entire rode (sparing the last 20') to gain any advantage?
Generally, i'd find it preferable to slip a little chafe gear over the rode where it passes through the roller, same as with docklines, mooring lines, etc. Also, the wear really ought to be coming on the (shorter, cheaper, and more sacrificial) snubber, not the rode itself.
There is the arguement that having a 3-strand nylon/chain rode does away with the need for a snubber. Aside from the chafe issue, i've encountered at least one other situation where a snubber would have been handy with a nylon rode; with stem-mounted offset anchor roller and a bowsprit, where a bowsprit-end-led snubber would have made all the difference in the world.
The trouble fo me is getting the snubber to stick to the rope rode (no chain hooks/claws here!). i find that a well-formed rolling- or midshipman's hitch works pretty well on three-strand line. Another idea i've seen work incredibly well in dry applications (and would like to try here) is a prussik made up with a short selvagee. If someone has a better way (or two), i'd sure love to know.
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