I've used the Zone VI head without the compensating timer. It has two electrical connections - and I don't know if I remember how they work exactly, but one is powered all the time to keep stability in some manner, and the other is switched. When I used it, I would switch on the light with a card between the lens and paper, wait a few seconds to give the light a chance to stabilize, and then make the exposure.
I think the main use for the compensating timer was to ensure consistent results through long print runs. I never made more than two or three prints at a time, so I never saw the variation that longer runs can exhibit.
Of course, the timer also had a provision for dry down compensation.
Unless your doing large numbers of prints, I don't think you will miss the absence of the timer.