Needle Nose. Split ring pliers. Both do a good job.
Just make sure you turning the right way. (Clock\anti clock)
Use another torch and look at exposed thread ABOVE the item you removing. you’ll see thread rotation there. (left\right handed)
I’ve never found one I couldn’t unscrew yet. Although the left handers frustrated me the first couple of times till I realised they existed.
If they been there a while and set in.
Do as we did on the old well locked on nuts on machinery.
Tighten FIRST. To break any binding\corrosion in threads.
Maybe spray a dab of WD40 etc coupla hrs b4, to loosen the binding hey.