Modifying an amp evaluation board to bias the coax?
Doing what was done in that blog post should work fine in this case as well.

I'd stick the inductor vertically on the microstrip. Be sure to place it on the far side of C1.

Tack the connecting wire to the top of the vertically mounted inductor, and either keep it short enough it won't catch on anything, or glue the wire to the PCB as strain relief.

It'd probably be a good idea to bypass the power to the inductor as well, so it doesn't form an accidental antenna or potentially radiate RF. If you're using the same voltage for VCC as the bias, I'd just run the wire to one end of C4. Otherwise, tack a SMT cap to ground somewhere, and pass the bias connection by the cap terminal.