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@lae
A G-clamp won't work, it'll twist around as you tighten it and slip off. I've also broken a vice handle trying to remove a cotter pin (it was quite a small vice with an extension tube over the handle though).
The best way to DIY it is a big heavy claw hammer and an old seatpost supporting under it. The seatpost/tube is absolutely essential. A rubber mallet ain't gonna work at all!
My latest cotter pin adventure - cotter pin on new bike had no nut on it but I chanced that it was safe to ride home. Stood up to get away from the lights, pin half fell out, cranks turned and it's now bent and mashed up. I'm gonna go at it with a drill tomorrow and see if I can remove enough metal (without hitting the crank or the axle!) to somehow get it out, otherwise I'll have to cut the crankset up with an angle grinder.... Riding a bike with the cranks at 90 degrees rather than 180 is quite difficult!