Rookie mistake, bought a rotor puller 33mm x 1.5 outside thread, as opposed to "M33" x 1.5 inside thread puller. Arghhh. Oh well, must stay zen...
Pulled the generator cover today, zipped off the rotor nut with an impact wrench, but had to leave the guts open until I can get the proper tool.
Going to see if I can borrow one from a friends shop tomorrrow.