I hope you come up with some good ideas to remove the plate, My question is whether you can install new bushings around the existing tuning pins without breaking them. Plate bushings are under outward stress from the tuning pin and under inward pressure from the plate. I foresee all the plate bushings breaking as soon as you drive them around the tuning pin.
Wow! 220 places to bind. In addition to hoist I'd consider putting upward pressure directly on the plate flange from supported keybed as wedges can only be tapped in on the stretcher side.
What's back up plan if the web cracks? If it lifts easy fine. Otherwise hear Jon, #2s are not so bad. As James cautioned, the pins are angled (the wrong way).
Now that I think about it, how can the plate flange move that way if it's presumably already tight against the front of the block? Hmmm? It may be a non- starter. I don't know….. Good luck if you try it. Hey, hey!