I believe that would be an “accessory shoe.” In the past, I’ve used a lightweight camera tripod as a mic stand by using a thread adapter to attach the shockmount to the screw on the tripod’s mounting plate. You may be able to do something similar to that: use a thread adapter to attach the accessory arm from your photo to a standard boom pole, then attach the mic as you normally would.
However, if you’re commited to the DIY route and don’t want to spend the money on a propper boom pole, you could try using a particulary long telescoping monopod. Back in the day, I was obliged to do this on a student film. I can tell you that while it does actually work, the brutal weight of the contraption and the mechanical noise made by the “piano key” section locks on the monopod made it a rather unpleasant experience. The day after the shoot wrapped, I ran out and bought the VdB carbon-fibre pole that’s been by my side ever since.
The bottom line is that I’d rather use a $200 mic on a $500 fishpole than ever have to make do with DIY boompoles again, and you may be only one 15-hour shooting day away from joining me on that matter.