Just FYI, Kodak used to list about 20 spectral sensitizing dyes in their chemicals catalog. They are still available somewhere AFAIK, and I have previously posted that list here on APUG. I suggest you look it up and use it to your best advantage. Also, Mees and James has a page or more of data on sensitizing dyes using the same data format that I have used here on APUG. After all, a spectrosensitometer is a spectrosensitometer.
However, doing R&D on sensitizing dyes is a very expensive and time consuming undertaking. Do as much as you wish, but the ones that I suggested here to Bill work very well for Br/I emulsions. In addition, Erythrosine works well if you use the methods I spell out. Data for that is in Mees and James as well.