Damaged Seized

Can a seized aluminum motorcycle engine be disassembled without further damage?
I am having a hard time looking for a rebuilt crate engine for my 1982 Honda silverwing gl500i.
I think I’ll need do disassemble the engine to see which parts I need if I cannot find a new engine.
I have searched many websites and have had no luck, only to find parts sold separately.
Were might I find a place that would be useful?
There are a couple of things to try when it comes to stuck engines, 1. PB Blaster by Justice Brothers, spray in the spark plug holes and let it sit for several days {keep it saturated} then try an impact wrench on the clutch bolt with the transmission in 1st gear. This gives you some mechanical advantage over the rust. Or try www.sportwheels.com for an engine.
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