As far as through holes. On digikey bourns is the main brand that pops for less than 10mOhm greater than 22uH > 15A. They have some in about 30mm spacing (yikes) and some in about 12mm spacing. For the most part 12mm is a vertical inductor mount. 1.7mm pin diameter. I didn't realize how big the pin spacing is on the flat ones. Probably would need one pin southeast of LED+ and one between Q1 and D1, with whatever interference that causes on the other side.
Here's one of the flat kind:
http://www.digikey.com/short/3bcd55
However there is also this:
http://www.digikey.com/short/3bcd55
http://media.digikey.com/pdf/Data%20Sheets/Wurth%20Electronics%20PDFs/S14100034.pdf
2mm pin diameter, 11mm spacing (close enough to 12, I'm sure they'll bend) and it's a horizontal off-center mount. That actually looks pretty good for us. But you have to look at the picture to understand hole placement. I'm not sure about that 5db attenuation at 1Mhz. Seems to be related to the self resonant peak. I can't pretend I've understood that issue well, which is why I've preferred inductors that just don't get funny until a few MHz, but these big ones just don't have the detail spec sheets.
Not clear if the bourns inductors are better. They just don't show as much detail.
One could I suppose solder some pins to the sides of one of these low resistance 22mm's we were looking at:
http://www.digikey.com/short/3bcdfz
but that's not very user friendly.