electric air compressors - much more efficient and less smelly
Wouldn't bet on it.
You lose the weight of the bleed equipment but gain the weight of the compressors.
I haven't seen the compressor design but, unless oil contamination is impossible, then that risk remains.
Seem to recollect on SCUBA compressors careful maintenance was truly VITAL although I'm sure there will be little design similarity.
New technology - ooh, err missus!