Hi Rhynardt, welcome!!!

Looking forward to your progress, photos, and contributions!
Don't worry about "offending purists" here. Not enough purists to offend on MadModders! Opinions, yes, but usually when asked for. Generally an extremely helpful, interested, and supportive group.
I'm not familiar with your mill attachement, so if it has a quill, this wouldn't apply, but if not, it's possible to buy a spindle and tapered roller bearings meant for a mini-lathe quite reasonably, and it's ground, keyed, pre-bored for and MT taper.
Personally, though (here comes the opinion) I'd be very interested, if it were mine, in cutting new helical gears for the spindle. Where there's a will there's a way, and I bet with some research, it coud be done in the home shop.
There was a great gear cutter project by DT Jacobs in old ME's that certainly could have done it, and I think a simpler shop built fixture for a one-off job might be built for the lathe (or mill) with some thought about the requirements.
Anyway, once again, welcome aborad!
