there is always the option of keeping the forum the as it is -

but still have the sub forum for those posts that we would like to be more easily available via searches- tech, med , articles.
They could still be posted on the regular forum but could be copied to the sub forum saving on searching time.

The benefit of having it as a subforum vs a sticky is a sticky take up room at the top of the page where a subforum would be a separate link to open.