problem in battery grip conversion

Problem converting a Canon500D battery grip for the Panasonic GH1/GH2.
Powering the GH1 works well for a while now but I'm working on getting the shutter button running. Made a mistake here.
The battery grip has a nice 2-stage button (full press+half press).
My circuit would work...if the full press would not ALSO close the circuit for the half press.
So at the moment you can only focus but not trigger a photo/video to be shot with that button.

So different from this one, I need to attach GND in-between focus and shutter, replace 3KOhm with 5KOhm and replace the 2KOhm with one that gives 2KOhm when used in parallel to a 5KOhm resistor (3.5KOhm).
Problem: That 2KOhm-resistor attaches to a 0.xmm trace on a tiny connector and took me days to get right without shorting any other pathes.

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