Meh. I personally don't even want to incorporate the baht symbol. I feel like it would cause confusion, even circled.
How about this :
I like Ⓑ a lot, but I thought it could be great to add the "currency-like" bars. It makes it closer to the logo, too.
I like it. The only downsides are that it could be hard to recognize or even write at small sizes due to the level of detail. Plus it seems like it would take a while to write even at normal sizes compared to other currency symbols.