I got news today that I can have an MRI afterall.
The MRI techs I guess can't make decisions that might have a health impact.
My internet searching led me to the conclusion that even though a free piece of metal such as the wire in my case placed in the machine moves it wouldn't (much) once tied into tissue. Suprisingly, none of the studies attempted to measure the force the wire might provide which would be quite simple to find out in experiment. However, one study did look for heating in metal stapes prostheses but found none.
I would suggest that if you get the run around like I did ask for proof of adverse events.
Note most studies used machines with field strengths up to three Tesla, I'd feel less confident putting my head in higher field strengths.
I suspect I might hear something if the wire moves or vibrates in the magnetic field, so it will be interesting.
Now all I have to do is to try and convince the MRI people to do my whole body and not just my neck (I've got neck problems). Seems to me if you've got to have an MRI may as well do the whole body. I mean if they find inoperable lung cancer no point trying to fix my neck