Just done mine. Same issue. Follow bodgers technique at your own risk:
I found there was enough room to hacksaw off each end of the stuck pivot bolt in the joint between bottom bracket/swingarm (the wee washer in the joint will probably die during this episode and need replacing too -eBay).
You can then remove swing arm.
Couple of enthusaistic blows with hammer and screw driver destroyed bearings enough to get out remaining pivot bolt/central tubing/rusted on bearing centres (which need hacksawing again to free central tube).
Knocked out exterior casing of bearings, done.
You have to be very careful with the paintwork during hacksaw phase.