The idea of a bloke filming me and by-the-hour girlfriend does not appeal unfortunately.
However, if you were to instead arrange it so that it was another
lady filming us, that's something else entirely. If the footage (and lady) were of suitable quality I'd even be prepared to pay for it.
I have in the past arranged FMF threesomes where part of the session consisted of handing one of the ladies a phone/camcorder and having them film/direct as appropriate. Good fun, and all agreed beforehand of course.
So OP, if you're going to start with this venture, I suggest you hire and train some suitable female employees!
Happy to write a review as your first customer.