Let me start off by saying that I have no idea how these bushings look, work, are located, or how easily you can beat and bang on them. Therefore, don't take anything I say for truth. Only as a possible suggestion. But I have replaced bushings in leaf springs on 30 ft equipment trailers many times before, and this is what we did.
First, find a bolt (preferably course thread) that will screw into the bushing; the tighter, the better. Screw that bolt into the bushing a good ways, I'd say probably and inch or a little more. Then beat on the head of the bolt to push the bushing out. Once its about halfway out, unscrew the bolt from the bushing. Then get a larger bolt (or whatever will fit relatively tightly in the hole) and beat the bushing the rest of the way out. You can also use some channel lock pliers to help pull and wiggle it on the other side, if needed.
This doesn't always work, but it does more often than it doesn't. If the threads won't hold when you are beating on it, or if the bushing doesn't want to unscrew from the bolt, or if it just wants to be a PITA and not budge anyway, we then reverted to the torch.
Hope this helps.