Yes, it is possible, but to the best of my knowledge, a nice simple plug and play adapter does not exist. Rather, it is necessary to buy a few parts and wire them together. And the result is somewhat ugly and messy -- a Little "Monster" Dot, if you will. lol
In short, to use 6DJ8, all you need is a 9-pin breadboard socket and two 7-pin test sockets.
However, if you wish to roll double triodes drawing more than 0.45 amps of heater current, for example, 6SN7, it is necessary to put together an external heater supply as well.
So this will work for 6DJ8, 2C51 and similar low current double triodes.
And for higher current double triodes, an external heater power supply consisting of a step-down voltage regulator and a an AC to DC power supply is necessary. You might already have an AC to DC power supply, for example, an extra laptop power supply. Just make sure it is rated for at least 1.5A.
For more information, check out the Little Dot Tube Amps: Vacuum Tube Rolling Guide forum...