Quick one for anyone who might be able to offer advice.

I'm trying to change the rear shocks, and the lower shock bolts on both side are completely seized onto the beam. I've tried plus-gas, shocking them, drifting them and a bearing extractor (which just slips). Any ideas? I don't really want to drill it, or take the beam off to press them out and I don't have access to heat sadly.

Any help desperately appreciated!