Being a watch modder myself, I am always against the term "simple fix" used by watch owners, along with the inherent and implicit assumptions that it will only take x minutes, and involving a simple "xxx" procedure. Yes you could be totally correct, but it will be fair to let the person who will be doing the fix comment on how simple/difficult it is. Different watchmakers/makers have different skill levels, and what you assume as "simple' may be laborious for the guy actually doing it.
Competence, knowledge, experience and patience come into play when determining if a fix is "simple" or otherwise. In your case, the job requires the modder to dismantle the watch, hands, crown/stem etc to get to the dial. The marker adhesive then needs to be carefully removed and realigned, and then fixed in place. The job requires a good eye for it, and of course, steady hands and a delicate touch to get it done well. If it is so simple, why not spend 10min to do it yourself? I think it is not prudent to pre-assess the difficulty of the job and the time it will need to do it.
For the watchsmith, you can try contacting @SSTEEL. He is not in the UK but he is based in Europe. He will be able to solve your issue, but once again, leave the assessment of the job to someone qualified to make them.