why not make a simple extractor something like below use some heavey steel some threaded bar and a piece of tube for the pin to enter as it pops out
i would have cut the pin out with a hacksaw blade and i recon it would have taken just a few hours
tedious-yes
time consuming - yes
job done-yes
Has anyone suggested drilling the pin yet?, if you drill it out to within 1mm or so without breaking the drill bit, then the rest should drive out ESPECIALLY if you can cut between the centre hinge gaps, or it may if enough metal has been removed just hammer out, bit barbaric but it does get the job done.
Another way could be to just go for it with the angle grinder between the gaps, drive out the pins and then with the new pin put washers in to take up the distance, if your able to heat up with the gas axe the pin housing it should make the extraction easier.
but it would be doneno room for a drill or grinder ..and dremel would take 100yrs
If you're not concerned about the moving part,wedge it so it can't move.
Drill through the side inline with the pin centre.As you step up in drill size,the moving part and centre section of pin should fall away.
he does need the centre part its just the pin its self he needs to replace