Burnham
Woods walker
I vote no to climbing, too.
Nasty. Horizontal cracks on (what appears to be )the tension side of the stem are unpredictable, even the force exerted by a heavy top being released can cause faliure. Whatever method employed to remove it, caution & a gentle touch would be required
Tie into another tree? Is you loco? I hate when people think that's a safe practice. It is NOT a safe procedure! Tie into the upper boom instead.