As far as running a helicopter without blades goes, no problems for a suitably trained engineer doing that because it is not really a helicopter and hardly likely to get into ground resonance or suffer excessive blade flapping and damage droop stops or chop its own tail. Its just a collection of mechanical systems, like a complicated generator set.
On the other hand, if there's no engineer available out of hours (and most seem to work office hours in UK), why not let pilots fix their own faults? Some are quite handy with a spanner and a multimeter....