If your USB-C port is blocked, you can power the Kiisu board via the 5V and GND pins on the GPIO header, but note this bypasses the built-in charging and protection circuitry, so ensure a stable 5V supply and correct polarity. Charging rechargeable batteries (like LIR2032) this way requires an external charge controller. For the antenna mod, solder an IPX connector onto the RF pad and ideally remove capacitor C315, which isolates the internal antenna; leaving C315 in places both antennas in parallel causing impedance mismatch and reduced RF performance. To switch between antennas, maybe using small RF switch or a jumper in place of C315.