You know, that's not that far-fetched. I thought about a double doser... but haven't figured that one out yet. I definitely want to keep dosing K and N via powerhead, which doubles as an evaporation top-off. Leaving P out of the macro solution might help to extend its lifespan...
Lifespan of the plungers... good question. Time will tell. The small syringes are really thought for one-time use, so it will be interesting to watch them.
One nice thing is that due to the slow movement of the timer and the two check valves there isn't much chance for big spills.
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