Lathe motor upgrade, is this overkill?

SB used bed length, my 42" bed has 22" between centers.
 
I put a 12 hp lawn tractor engine in place of the 8hp one that spit the rod out the side of the case.
So far, (15 years) all it has done is mow grass, and burn fuel:cautious:
 
I do have a 2hp motor I just realised. I just thought if I remove the reeves drive and just use the vfd that means I will be running it at 30hz which is half speed almost all the time, is it gonna wear the motor out? would the 2hp or the 7.5hp last longer in this case? They are both inverter ready motors
 
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