Gene, I use a developer with some of the same components (catechol and NaOH), and I would imagine what you're proposing should work. I've never tried mine as a 2 part developer, however. Barry Thornton, who created DiXactol, which also uses catechol and NaOH, originally suggested it be used either as a two part or combined developer. (He has since stopped recommending the two part option, however. I don't know why.)(posted 8157 days ago)As an alternative, for additional compensation with the Windisch formula, try diluting it further. I would suggest combining A & B, but use 1/2 of solution B and reducing agitation to 10-15'' every 3 minutes. This will likely reduce contrast by N-2 without significant loss of film speed.
My only caveat is sodium hydroxide losses steam fairly quickly, which is what makes it so valuable in compensating formulas. So it might exhaust too fully before you reach your desired density. Therefore, if you find you loose too much speed or contrast, you might have to increase A by +/- 25% with the reduction of B.
As an alternative, you can halve A with full B for much the same compensating result. However, generally I've found better midrange separation with the first method.