Well, if comes down to the continuous AMP draw of the bulbs? Do you know what it is? Do you have an inductive amp meter than can measure it?
What I did on my 32 cabriolet was take a 34 generator and I sent it to E.J. Whitney for their alternator conversion. The create a bit bigger middle section, graft an alternator into it, add a cutout that looks completely stock and it works fantastic. It has good bearings in it so I've had no problem with the 32 fan setup, it looks stock and it puts out the juice - exactly what I wanted.
I've been running the unit for about 7 years - has worked flawlessly. They are good folks as well - highly recommend them.
The unit isn't cheap - but you definitely get what you pay for!
https://ejwhitneyco.com/automotive.html