When I go to yard sales, etc, I look at old tools - I buy anything that I can modify if it is cheap enough.
Like a small pry bar made from a screwdriver, or a WV hubcap puller made from a small Phillips screwdriver bent to a hook.
I have a good number of cheap wrenches made from flat stock - a six-sided flat wrench fitted to your bolt (grind to suit with a Dremel tool) might be just what you need.
There are sockets with curved spiral channels that force the socket toward the bolt as you apply force.
See - https://www.lowes.com/pd/IRWIN-BOLT-GRIP-5-Pack-Bolt-Extractor-Set/1000363541?cm_mmc=SCE_PLA-_-ToolsAndHardware-_-SpecialtyHandTools-_-1000363541:IRWIN&CAWELAID=&kpid=1000363541&CAGPSPN=pla&store_code=1198&k_clickID=cdfafdb4-c45e-4e5a-8c41-18e886eabc07&gclid=EAIaIQobChMIy7HY752u2QIVWLnACh0_MgnBEAQYAiABEgLX7_D_BwE
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