These are very weak dyes and may have been used. IDK for sure. Anthrocyanines are also used but are weak and higher in molecular weight so you get less bang for the buck. Phthalocyanines or Merocyanines are often used. Look at Brooker's Merocyanine as an example. Leslie Brooker was the founder of the dye lab at EK and his work points directions for dye usage. Today, all dyes at EK are numbered using the Brooker system and so we have B-11774 and etc....
This dye, Erythrosine B (CAS: 54530) or Acid Red 51, is available here on eBay for chump change. This dye is in the Kodak list above.
I'm really interested in finding cheap sensitizing dyes for spectral sensitizing, and not necessarily because I am going to try to make a color-sensitive film tomorrow, but to put the possibilities forth so that anyone making emulsions might be inclined to experiment with this stuff down the road.
Sure they might not be the best or most efficient, but they will work, no?
Also, to make panchromatic dichromated gelatin for holograms they use methylene blue as a red sensitizer and Rhodamine G6 for blue/green. Do these dyes have any effect on silver-halides?