There are two super solvents often used in chemistry for stubborn jobs.
One is dimethylformamide, and the other is dimethylsulfoxide.
They are both very powerful and both will carry chemicals directly into the human body via the skin. As such, dissolving asprin in dimethyl sulfoxide and then rubbing on a sore joint or the head will cause immediate relief from an ache. It was severely restricted in sales for that reason. It was once used rather freely in sports and drug use. I should say it was once abused freely.
In any event, with proper precautions, using double gloves, you might be able to dissolve the glue with them. Another caution, it can strip off paints and ruin finishes depending on the nature of the finish. Test them before use and be very careful of the liquid before AND after use.
After use, the liquid will be quite toxic due to all of the things the liquid dissolved during use.
This is a way out suggestion using cutting edge solvents. Don't get 'cut' using them. Take great care. Please note that I'm posting this as a last ditch possible solution. I take no responsibility for misuse of these two solvents.
Also, highly cross linked or high molecular weight glues sometimes cannot be dissolved except by a strong acid or base and you don't want to use that on your camera.
BTW, as a side note, DMSO (dimethyl sulfoxide) all by itself is not very toxic at all, but DMF (dimethyl formamide) can be toxic under some conditions, but by itself with no extremes, it is also low in toxicity. We used DMF to clean our labware at Kodak. With acid or base and heat it can decompose into methyl alcohol and formic acid.
Acetonitrile is a third possible super solvent. It is similar to those above but is less polar, as the above solvents dissolve freely in water.
PE