I'll assume you have an All-in-One or a Modular kit. While you could create an adapter board and make 6 of them, the hardware and time involved would hardly be worth it unless you have a lot of those tubes and plan on making more kits with them. Much easier to just buy a set of IN-14's on Ebay and save the others for another clock like the Classic kit.
For tubes that have pins (as opposed to wires/flying leads) I would recommend you build a 'socket' using some of
. These will fit the pins on your tubes, you can get them in smaller quantities and the vendor provides recommended hole sizes for PCBs.
I have an adaptor for these tubes on
, but not for Ian's hardware (they are for breadboards). If you need footprints, I can provide them for Eagle and KiCAD.