cheapheat, I believe that will work as long as there are no els in the pipe before the DV. One sure way to find out is make a test pipe and try it, Check the draft with a manometer or draft gauge, plus use a CO detector to verify no leaks.
As with all DVs that mount on the stove and pressurize the vent pipe, sealing up the system downstream of the DV is very important.
The Tjerland style DVs are exclusive to Alaska (or at least I have not seen them on anything else). Keystoker uses a factory built adapter and a standard draft inducer from the oil burner kingdom.
Anyway, enough rambling, I think you could probably make your idea work, although not sure if the insurance guy would like it.