Drive shaft siezed in power head of forward-gear-only small outboard - (1987 2.5 HP)

Good Trout To You Sir

Petty Officer 3rd Class
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May 22, 2018
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This is a portable motor (approx. 30 lbs in weight). "Forward-only" style motor (no neutral or reverse). Attempting to replace water pump assembly. Not original owner.
Lower unit removed BUT drive shaft stuck in power head. Motor, shaft, housing very clean inside and out. Probably never touched saltwater. Motor currently suspended upside down with periodic PB Blaster to drive shaft & angle change over 3-day period. Still won't budge. What can I do to remove shaft AND minimize chance of damage to power head, shaft, seals? Use some other penetrating solution? If heat suggested, risks to seals, metal?
I have 2 weeks, then out of time to repair. Help!
 
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