Lobo brings up a great point imo.
A possible solution to being able to use less expensive off the shelf products is that OWB Pancake holsters tend to be open toe, allowing the final 1/4" to protrude. That may or may not be okay depending on the activity you engage in.
Or you could go slightly in the other direction and use a 5" open or closed toe of whatever design strikes your fancy.
Just my $.02.