>> The best tactic at work is to be really competent in the main job and push all energy into furthering the skills and experience and recognition in that and dodging all the crap work by appearing badly suited to them.

You can just say "no" and avoid all this. I figured that out as a junior programmer, when a middle manager asked me to create a graphic on a day when everyone else, including all the design team, was in a hackathon (I was stuck working because junior programmer).

It wasn't even a thing I had to think very much about. I was so annoyed to be asked to do work nobody hired me to do that there was no doubt in my mind about the correct response. I dont' think it even crossed my mind to do the job but bodge it. That would mean I'd actually have to, you know, do the job.

So while I recognise the situation, that once you pick up a task you're stuck with it forever, like it or not, I disagree with your tactic. Spending time doing work you don't want to do but badly is just wasting your time and it should be avoided.