Foma make a special film (Fomapan R100), presumably with a clear base, and also a relevent kit to produce B&W slides.

I've not tried the Foma yet, though I have used various kits and mix-it-yourself formulae successfully over the years, and also the old Agfa Dia-Direct and Scala films. I think my last efforts were using the Ilford published formulae.

B&W Reversal seems rather neglected nowdays, but it's a well-established technique for still and movie, and a half-hour with Google should give you lots more information.