Your numbers seem right. Should work fine. Perhaps the 168's will dim more than the 123's over time as they discharge, but you'll have to suck it and see I guess; unless someone has done lux/time tests on this combo.
Im not sure it's safe to run 3 Pilas in series. I remember this issue being bought up in CPF chat before, and Pila arent happy with folks running more than 2 at a time. Also, consider other things like voltage sag and internal resitance of the cells. Im sure the Pila values are different from CR123s.
Seems like a *mild* overdrive using 3 Li-Ions. Voltage sag should bring them down below 12V. Only way to tell is to try it. If I had those lamps, I would try it myself since the risk is low in my opinion. Let us know how it turns out if you do.