I took a look at the Dutch pages again. The other form, http://www.home.zonnet.nl/rsetteur/a...dex_doseer.htm
seems to be a diy peristaltic pump. This one has no parts to wear out (ie, plungers, gaskets), practically solving your part wear problem.
The link above says this model doses about 0.75mL per 24 hr period, just enough for micros.
If the flow rate is excessive, one can place an airline valve inline to restrict flow, as backpressure has no effect on the peristaltic pump design. If you tried restricting the flow of the plunger-type pump, it would be a disaster.
What do you think about the diy peristaltic? A go or no-go?