Evening Thrash,
I'm completing the belt/components service also.
My balancer is no doubt the same as yours hopefully, so here's my advice.
The balancer is not a pressed fit. It definitely should slide free from the crankshaft snout.
The balancer does not have threaded holes for a puller.
The two bosses are for a holding tool, when tightening or loosening the crank bolt...
You most likely have some rust interference holding the balancer in place.
Get some penetrating oil spray (PB Blaster or WD40, ) and shoot it into the snout area of the balancer, primarily in the key way. This should seep into the remaining area of the snout/balancer and soften up the gunk holding the balancer.
Take a hammer and GENTLY tap on the balancer, side to side and forward and back. This will cause a harmonic effect and draw in the penetrating fluid.
Remember, the balancer is cast iron so gently tapping is key.
You don't want to break it.
No Ham Fisted mechanics allowed!
Repeat as necessary. You will eventually get it to move and remove. Clean the balancer and crack snout with some Scotchbrite before reassembling. Good luck with your project.
G. In beautiful Boulder City Nv.