In short, I would look into why you aren't getting good results from digital, as well as exploring your film options.
I agree. Until we went digital in 2002, we used to use Kodak Ektachrome EPN in 8x10, 4x5 and 35mm for most reproductions, with Fuji Velvia, in the same formats, whenever we wanted more contrast and saturation. We photographed all manner of subjects: sculpture, paintings, photographs, drawings, as well as works in situ, and events, et cetera, with the same films. FWIW, we used Kodak Tri-X Professional in sheets and 120 rolls, Tri-X 35mm, as well as Ilford FP4-Plus in 120 rolls and 35mm for B&W work.
We are 100% digital now, and the results, especially for catalog photography have never been better. I just finished a shoot for a catalogue and saw the finished book yesterday; the results would not have been possible without digital--but I digress.
As much as I love conventional silver halide photography, some things do work better in digital.
(Note to all readers: PLEASE don't bring down the wrath of the conventional community on me!! I promise to be good!! I'm going home tonight to work in my darkroom, honest I am! I have 15-odd contact sheets to make!)
Anyway, drop me a PM if you would like more information on reproducing works of art digitally...it's what I do for a living.