Thank you very much for your replies!
JensL - Yeah, that bassline is a bit overboard - I generally imagine playing it as quarter notes. Could you recommend me a Charlie Hunter album for this? In what little I've heard of him (YouTube) he did mainly jazz-rock with simplistic basslines
As goes range, I've always pondered on that and recently realized that artificial harmonics could help in that regard a lot - one has an extra octave if one uses the regular A.H.s (where one plucks at the 12th fret higher than the note), and another extra octave using 5th fret ones (pluck the same way as a regular A.H., but 5 frets above the note - resulting in a note two octaves higher!). I've never seen anyone use them that way, but I'm working on it and it certainly is possible.
bako - Many thanks! I shall work on it as you say. It certainly is easier to play this way on tapguitar (which I also play) for the very reasons that you mention. But I'm just strangely obsessed with being able to do it on fingerstyle guitar :|
Technique and fingerboard learning are not that much of a problem for me - but focusing on multiple lines together is plain maddening. I hope it resolves with experience.