I have my keezer next to my fermentation fridge, but in principle it works the same even if it's a bit farther away.
Basically I just have one of the CO2 lines in my keezer slightly longer than the others, and run that out to my other fridge when transfer time occurs. I have my blowoff tube set up with a male MFL fitting, and so I pull off the gas disconnect from the line coming out of the keezer and connect MFL->MFL fittings. But the principal is the same.
For you, here's what I'd do:
1) Get a long (10'+) line of CO2 tubing. Have it hooked up to a gray gas disconnect on the keg side, and to something like this on the CO2 end.
2) Get a shorter keg->keg "jumper" like this.
3) On transfer day, just hook up the long CO2 tube to your normal CO2 in place, and jumper from one keg to the other, and transfer.
I do recommend transferring at lower pressure than you normally serve beer, as a slower transfer helps you to avoid sediment. And when doing this type of transfer, it might be best to do it with a shortened dip tube in the "source" keg to ensure you're not picking up any sediment.
But it's a relatively easy proposition here...