Howdy, Abanaki!
Others have talked about getting a full buckhorn and perhaps a higher front sight and then using the buckhorn as a kind of large peep or "ghost ring" sight. The reversed sight, as mentioned by Fox Creek Kid, seems to have quite a few supporters as well.
Could you simply take a triangle file and open up the sight cut? It wouldn't be too hard to make it a squared sight cut, either. That'd keep it as "original" as possible. A little re-sighting and you're back in business, and probably wouldn't have to replace the front sight. Matter of fact, I don't think you'd have to change anything. Of course, if you have trouble seing the front sight if it's too skinny, I'm sure Marbles (from Brownells or other suppliers) would be able to fix you up with a wider front sight to go along with your "widened" rear sight mod. Whatever you do, have fun!