Thanks Gents..
Clearly .. at least now :-) I'm going to give the remote valve a try.
No NV breakage issues and No fingers in the prop problems.. welll almost :-) 100% reversible and transferable, as bonus.
Have a few KK TD NV gizmos, never occured to retrofit one of those onto the norvel. Yer a far more determined man than I mr CP :-)

I have a VA mk1, fitted with a very tight to the venturi, large nubbly brass wheel that makes even the Cyclon one look 'far away'.
Sure it's less exposed, but scary to use.. maybe I just need a plastic glue on longer thumbnail ? otherwise, ain't no free lunch, as always.
But I'm.. not... dismantling working setups to make this one work, this is a standalone exercise.