Tips to remove consol bush bolt on front swing arm. Very stiff been at it for hours.

Trying to get bolt out that goes through bush of swing arm to consol bracket and its a nightmare. Was very stiff and creaky when first undone slightly so been soaking it in everything I got and managed to get it out so far but its seizing if I try anymore. Can wind it back in again but seem to have hit a spot it wont come out any further and dont want to strip alloy threads. So far been soaked in wd40, penetrating oil, Diesel/ATF mix and engine oil with white spirit and its not making any difference. Does anyone have any ideas. Been at it for hours. Tried some heat with a heat gun but wary of propane torch as its a petrol car and I have a lot of lubricant everywhere. Was thinking of removing consol bracket and soaking but swing arm bolt goes through subframe so wouldnt be able tor remove complete without removing subframe. Any help or pointers welcome.

Alasdair