Update: the bolt has been removed through a combination of showering it in WD-40 and applying ungodly amounts of torque with a comically-long pipe.

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Thank you for all of your suggestions! Considering the thread closed.

I suppose we've all got that person who's got the magic touch. He sounds like quite a character! Sorry about your loss.

Thank you for the suggestion. Although at first glance it seems that it'd work, twisting the stand simply turns the bolt in its place without undoing it. In fact, I went and bought a handsaw to see whether I could slip it in to cut the bolt, but unfortunately there was no good opening where I could slip it in. If I'm not able to free it through cheap and easy methods, then I'll probably leave it as is. If it ain't broke.. (yet)

Certainly a more active measure than staring at the problem hoping that it fixes itself

Thank you for the comment. I'm going to avoid the torch as much as possible. I think that I will try to gain more leverage on it with a pipe first. If that fails and damages the bolt, then I suppose destructive methods were inevitable. Unfortunately cutting the top part of the bracket wouldn't completely free the bolt as the top part would not fit through the hole in the bottom plate under it.

Quite an interesting idea! It's a shame that I don't have power tools else I could have attempted it. I'll go with less destructive methods first and see if anything changes.

There is welded-on material under the bracket that would prevent it from coming out of the bottom. The bracket also hits the frame while it turns.

Thank you for the suggestions! I think the easiest thing to try first is the pipe to gain additional leverage. Given all the things that I have tried, my strength has been one of the limiting factors. Other options such as power tools or heating aren't practical in my case. I'd like to avoid spending singificant amounts here.

Tightening and loosening I have tried to no avail. Unfortunately, hammering is not feasible given my setup, which is basic hand tools and the public bike shed as my work area.

Being in the Netherlands, bike repair shops are abundant, however, they don't seem to be willing to deal with a job like this. I have asked around already. Might consult a car mechanic if I have no other feasible options remaining.

Yes, I have tried doing so. I've managed to keep the stand in place to try to undo the bolt itself by simply holding it in place with my foot. That technique has worked well enough that the only constraint became how much tension I could exert onto the alan wrench I was using.

Thank you for all the suggestions! I didn't expect to get so many suggestions. I think the first thing that I will try is getting a hollow tube to increase the tension on the bolt. Unfortunately a lot of the suggestions are not practical in this case due to the limited amount of space to extract the bolt, or due to cost concerns.

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And yes, I have tried to twist the stand instead of the bolt, but the issue is that the bolt is stuck in the stand itself, so twisting it simply twists the bolt without undoing anything.

Additionally, I have no power tools. If I did have any, the way I would go about it would be to grind the stand off, as anything else would not be able to work within the tight space.