In reply to JLittle:
Thanks Andrew and Iain, and all others for your helpful replies!
I am going in May, and going via Gokyo and the Cho La pass to Lobuche. As my TX4s are not GTX it sounds like I'll be better off in the Scarpa Rangers, even though they're rather heavy (good training..?). Bought them and used them now, cheap at least.
May bring both then, as well as crocs for camp, although that's starting to seem a lot like luxury!
I've cancelled the Gran Paradiso trip - juggling costs not the least reason - so will just do more tours around Scotland instead. Would it be madness to break in the double boots on a Scottish I/II, assuming good conditions?
Looking forward to it, thanks again - and maybe see you out there Andrew!