Well, given our likely around 25,000 character profile pages, doing this over time would mean a lot of extra edits for me to monitor/patrol every day for a very prolonged time period, which is even worse than the alternative, which is to only allow experienced members to volunteer to help out, temporarily turn them into Bot accounts, and forbid them from doing any other tasks until after they are done with their assigned part of the work.
Also, if we drag out this project over a few years, the wiki would look very messy in terms of organisation for a very long time, which is unacceptable. It would be better to have it done quickly.
However, even after we would be done with the project itself, this would give me ongoing extra work, given how very frequently I already have to inform our members to update the tier categories during statistics changes, and after this they would have to do so even for every single minor tier update, and most of them would not know or remember this according to my experience.
Also, as mentioned earlier, the sheer required workload for this is much better spent on other projects with much greater necessity and/or payoff, including the infobox-adding project, and given how hard it has been to finish even smaller projects recently, it is very uncertain if we will even get remotely sufficient volunteers for even the infobox project.
Muddling up and prolonging the infobox project with extra work instructions also seems like a bad idea. We should handle one thing at a time.
Anyway, I have added this suggestion to the to-do list. Please be satisfied with that solution, so we can end this discussion.