I’m not 100% sure I picture the physical limitation of your setup… but all you need is to link up BCM23 and 24 from the Pi (and power of course) to their equivalent on the female header of the blinkt, for example with jumper wires.
Possibly. If your zero has no header yet than your options are still very open. If not there are some headers out there you might be able to pop onto the zero and shove the Blinkt at a 90 degree angle.
… it’s very hard to tell you what might be possible without knowing how your Pis all fit together currently to be honest.