I've substituted Dektol 2+1 for Bromophen 1+1 in Ilford's B&W reversal process, with very satisfactory results; I arrived at that dilution by comparing the standard printing dilutions that give 90 second development with RC papers. So, it's pretty reasonable to suggest you can mix your Dektol stock to 3/4 the volume given in the instructions and pretend it's Bromophen.
Do be aware -- Dektol is a metol-hydroquinone developer, and as such, may cause allergic skin and respiratory reactions in those who are sensitized to metol; AFAIK, Bromophen is a phenidone-hydroquinone developer, and won't produce allergies as metol can. If you've ever had a rash or asthmatic symptoms after time in the darkroom, you might want to trade the Dektol for real Bromophen...