Oh dear! I get the picture now.
Unfortunately if that's the case it's made worse by the fact that the bolt goes through a silent block bush in the bottom of the shock. That is to say a steel sleeve encased in rubber. Which is going to make things more complicated when it comes to drifting/turning even with the bolt head off.
You're making me feel good and bad in equal measure, as I considered buying that bike a while ago.
I think it's time for a deep breath and rolling up of the sleeves and stripping it out to remove the swinging arm along with the shock. At least it can then parade in front of various specialists.
I would be considering spark erosion at this stage.
Long ago, I met a chap who had spent about 6 times the value of a Tiger Cub, totally restoring it. He'd had to have a bolt of some sort, spark eroded out of a casing.
This literally evaporates a steel fastener out of it's surroundings without any damage to threads or anything.
No idea where you go to get this service, but worth looking.
A hydraulic press would push the bolt out once the head is off, but the jigs and tools to hold the arm and then press through the hole would be quite complicated.
Either that or find that Gynaecologist who wallpapered his hallway through the letterbox?
