Paul - I'm not familiar with the Viponel timers, but if you start a thread in the Darkroom Equipment forum here, I'll sure you'll get some responses.
I've got the dichroic color head as well, and it makes it very easy to dial-in filtration for B/W printing. Been doing a lot of split-grade printing and it's a lot quicker than using filter drawers. If you don't already have it, the Ilford Contrast Factors pdf gives you the settings to dial-in for single or dual-filtration with B/W paper.