I would second the advice to talk it through with a helicopter FI.
Flying helicopters is extremely visual - I know flying fixed wing should be too, but in a helicopter staring at the horizon really is essential, backed up with glances to check that some lights and needles are showing 'safe'.
The consequence is you could be half-way through a PPL course before anybody seriously expected you to deal with any numbers, (as opposed to needle positions on a dial), and by then it's a bit late to find out.
But there is lots of pre-planning in helicopters anyway, because your hands have to be on the controls so much of the time, so you might not be that much worse off than everybody else.
I hope it works out for you.
I guess that's 6 of one and a half-12 of the other?