www.makeitjones.co.uk makes really good quality holsters.
As far as the m1917, you can find decent resin copies on ebay from time to time. There was a time where you could get the PFC(Plug Fire Cap) versions but they are nearly impossible to find. Member @Scarednab is finishing up his run of a metal "working" replica of the M1917 and there was one for sale in the Junkyard a month ago or so. I don't know how Con friendly it could be though since it is a pretty accurate and metal replica. Maybe fashion a removable plug for it to show the Con personnel?