For what it’s worth I fitted one last night and seem to have got away without bleeding it. I did this :
1) Un-thread remote from hose
2) Pass hose through frame
3) Cut hose to length
4) Thread remote back onto (now shortened) hose
Pretty much did this using the cable housing and red screw in bit to pull the host through, cut hoses while vertical so as not to spill fluid, don’t seem to have had any leak and it works in fast and slow modes.
As it all appears to be working as my (non steath) reverb on my old bike did I was hoping I could get away with not bleeding, doing a tubeless conversion tonight so only want one potentially frustrating bike related task before the weekend if I can help it. But if it will save more hassle in the future I may as well do it.