Hi Blazer,
As others have said.........the only real solution is to get your stoma revised. I know......you don't want to go through another operation and all that........but if your stoma isn't protruding past your skin, you're going to be chasing this demon your whole life and are never going to win. You might get times when things work, but they won't last long. And you'll never have confidence or peace of mind. I struggled with my flush stoma for 7 years or so before finally biting the bullet and having it fixed. It was a very simple procedure and could have been outpatient if the doc didn't want to make sure everything was fine, but I was released from the hospital the very next day and couldn't be happier. I don't even think about leaks anymore and it went a LONG way to getting my life back to normal in so many ways.
Of course, there could be complications, and your surgeon will discuss that with you. If they find your stoma can't be simply snipped free, pulled out, and resewn back to your skin, then they may have to open you up.........and that's a 3-5 day stay in the hospital. But if they repaired your hernia just 4 weeks ago, I'm sure they looked around to make sure there were no adhesions or issues.
Go have the conversation with a surgeon who specializes in stoma placement. Don't use the person who repaired your hernia, but rather find someone who has a good track record with stoma placement. Find out how many they've done and what percentage didn't work out so well. Placing the stoma is a bit of a crap shoot, but those who've done enough of them know what they're doing.
So far in my journey as an ostomate.........having my stoma revised has been the best thing I've ever done. You won't regret it even if they do have to open you up. A week of incision pain will get you a lifetime of easy ostomy care. You'll find it's a whole new world with a correct stoma and it'll be well worth it. And I'd say the same thing to anyone with a flush or recessed stoma. Your life can be soooo much better if you just have a proper stoma. Replacing your barrier/bag will be just like changing a Band-Aid on a big cut. My barrier changing time went from an hour plus to 10 minutes from when I grab my supplies to when I'm done cleaning up the area. It's an amazing change. Go get you some!
;O)