So let me see if I understand...you want to have a rack panel with forward facing XLR jacks that have a separate phantom power supply powering them?
If you only have the one mic needing phantom power, if it was me I’d be getting a 1U panel punched for standard D-type panel-mount connectors like this
Redco 1U Punched XLR Rack Panels with Label Strip | Redco Audio, and then buy whatever combination of D-type connectors I need/want (i.e. female or male XLR, or female TS/TRS, or combo jacks, and then soldering up multicore to the back of those jacks and plugs to the other end of that to plug up to my mixer’s jack panel. And then I’d just be using an inline phantom power supply to power the one condenser mic. I have one made by Stewart Audio and also an old Rolls one...so it’s not a whole preamp, just a phantom supply. If I had a whole mess of condenser mics to power on a mixer with no phantom power, they DO make multi-channel phantom power supplies, so there’s that option, but they do, of course, get more expensive as the channel count goes up. I suppose if you wanted to get adventurous you could wire one jack on the panel as a phantom power input and then wire up a phantom rail across the mic jacks on the panel...use the single channel phantom supply as the supply for your rail...replicate the rail from the M-300B or something...it’s not complex, but you would need some small value capacitors and of course some hookup wire. I did this with my Tascam MX-80 rack-mount 8-channel mic preamp. It has the rail components built-in, but no onboard phantom power supply...from the factory the MX-80 came with a bizarre 2-pin XLR jack that is completely unobtanium, so I replaced the 2-pin jack with a standard 3-pin, and then just plugged the output of my Stewart Audio single channel phantom supply to the phantom input in the back of the MX-80. You could recreate the passive guts of the MX-80 on a rack-mount jack panel. Outside of that I don’t know of an XLR patch panel that has built-in phantom power. So, again, for me, if the goal was to remote the mixer jack panel to the front face of the rack, and I was also wanting to phantom power one mic, I’d make up my own jack panel with integral snake to the mixer jack panel and just get a simple external phantom supply to power the one mic inline.
Now here’s another question: how are you going to deal with the unbalanced mic inputs on the M-106? Are you going to just plug in those high impedance TS to low impedance XLR transformer adapters?
[EDIT]
I re-read my post...all relevant information I think, but you know, Brad, I also think the way most guys would do this (assuming you just have/use the one condenser) is to forget the jack panel, and for the input/output jacks on the mixer, just wire up a short custom snake and have a fan that comes out the back of the rack...no different than having a snake with a fan on one end for the mixer jack panel and a stage box at the other, only for your purposes you’d have a fan at both ends, and then, again, just use a cheap single channel inline phantom supply for the one condenser mic.