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I’ve never heard of anyone using isopropanol as a solvent for shellac. I once spilled a little bit of rubbing alcohol (70% isopropanol) on an old shellacked surface and it did dissolve the finish. I’d be interested to no know how it works for you. I’d recommend experimenting with a small batch on scrap wood before you use this on a real project.
If this doesn’t work out, you might be able to get ethanol from a camping equipment supplier. It’s used as a fuel for some small backpacking stoves.