Schematic:The ATTiny10 was pretty much perfect for this, just had enough pins for everything and it just so happens that I still had a bunch of them laying around.
All the ATTiny is doing, is sending pulses of different widths to put the BLTouch in the desired mode, as well as beeing interrupted when the probe triggers, so it can send out the next command.
The reason I'm inverting the trigger signal is because I'm also using the crocodile clip method, as mentioned above, and every time I switch between that and the BLTouch I'd have to change the "probe invert" setting in the GRBL software.
Everything fit nicely on a single layer, so it could easily be milled. I was actually really surprised how well this board came out.
I ended up putting a layer of insulating and protective coating (Plastik 70) on it, just to prevent possible shorts and to keep it from oxidizing.
The case came out looking pretty good as well in my opinion. I even added colors above the pins to connect the BLTouch without giving it much thought.