How to use custom counters in heading titles?

[SillyFreak]

This problem also looks similar to the following:

How to avoid a reset to the third-level heading counter after changing the first two levels?

Due to automatic counter step behavior when placing any heading, I’d recommend using a separate counter which you manually control, like below. Note that I’ve taken the additional step of updating the heading counter to ensure it is consistent with the separate counter, ensuring we don’t have to rebuild headings entirely to start using the new counter, but rather keep headings as they are, using counter(heading) like they always do. This also ensures they show up correctly in the outline withou…

The difference is, that post is about the proper heading numbering, while here you want the number as part of the title. Maybe it still helps or gives you more ideas.