Right. So as it stands. a) I have the wrong stuff, again : )
b) in order to facilitate the use of something like BR to create us a truly native chain we need to do a bit of hand-canadian? Understood. I think. sounds a bit like compiling in the old days on a donor machine with enough memory to make a compiler. I'm sure I'll be able to get my head around it.
c) getting stuff included in the various toolchains actually **might** happen, well that sounds worth investigating. if we can get a native kindle builder OOB then by Jiminy it has to be something at least worth pursuing. my experience of BR has been - as you initially suggested - solid, outside of known experimental side-issues with static.
d) we need to cherry pick BR structure. well that at least is easy. one bash script.
e) we need to patch makefiles. Installed Merge and now getting my head around patch and diff on linux. patch has me a bit fuzzy when referring to folders rather than files but it will all drop into place. Patching the files themselves is at the edge of my price range in terms of skills right now but I'm learning as I go

Nilujes patches are a bit ninja to we lesser mortals but giving them a good read does tell me lot (like - I need to know more). More of that type of thing for me I imagine.
f) config and launch a(n) interim/final compile of the tools - again another script. that part at least should be near trivial once we have the right settings.
So yeah, sounds do-able. Heavens aligning and all that. see what tomorrow brings.
Really would like to put my toolset to bed. I just want w/e amazon used lol. that will do