O'Rourke,
Index O'Rourke Leather , is now charging full price for his holsters, rather than giving them away like he used to, but his work is first-rate, and he can probably make what you need in a pancake. Lobo gunleather,
Lobo Gun Leather - Home , sold not so long ago by one of our esteemed members here, is another maker who I believe is capable of making what you want in a practical holster.
I have purchased holsters for slightly odd S&Ws from both of these firms, and have been very pleased. Their holsters work.