You could do that.
Offer it as an extra option (to the standard digital package).
An tie it to a fibre print.
Let's say your rate is 300$ per session.
Tell them for an extra 100$ they also get 2 traditional prints made from film on fibre paper, say on torso portrait and one head and shoulders.
If I were you, I'd use MF with a slight telephoto with smooth bokeh, say a Bronica with an 150mm f/3.5 S, or a Hassy with an 180mm Sonnar, with a traditional fine grain film like FP4+ or PanF+, and a greenyellow filter.
Maybe an orange one for the ladies to smoothen their skin, and a green one for the gents to make them look rough.
Then, the essential part, a nice fibre print.
Size depends on the pricing you can charge, but an 20x24" (cropped to 20x20" if using 6x6) from medium format would look nice.
TL;DR: offer the film service as an extra "special" add on to your main package, and tie it with traditional prints so you ensure it will look special compared to the digital shots.