I think it's a great idea to follow up on your posts with what you ended up going with, but keep two things in mind:
They might not have gone with the best solution to their problem. Specifically, we get a lot of questions with "no modules" restrictions that are usually nonsense for the average developer. Heed the advice given in other nodes before you accept the final "solution" as the one for you.
They might not want to follow up with the final solution, since sometimes it's because they made a stupid mistake or an assumption very early on that was not valid, causing everyone to waste their time chasing a problem that wasn't really a problem.
But yah, generally, I kinda like to see what people finally did, and when I post answers, I frequently do so with the average reader in mind, not just the person asking the question. Other people might get something out of that thread.