As others have said, if it's for your own use you can locate and install an appropriate font that has the proper "sharp" and "flat" symbols that match your ideal representation.

But if you intend to post anything here in Mudcat, or email it to someone else, use it on a webpage, etc., it's more sensible to ensure that everyone can read it, and that means using standard characters that will be read not matter what fonts the reader has on his or her PC.

So you could designate the hash/pound character "#" as the sharp symbol, and lower case b "b" as the "flat" symbol, and you would know that everyone, no matter where or what PC they were using, would be able to read it. Or you could simply write the words "sharp" and "flat" longhand like that, if you don't think the "#" or "b" looks exactly 'right' to you.

So for example, I can write "Bb" and "F#" and everyone can see it means "B flat" and "F sharp" respectively, providing I explain up front what I'm doing, or it's in the context of describing the chords for a song, for example.

I can't see that there's any big deal. Now what I want to know is how would you represent natural?

... I'll get me coat :-)