The thing about propane is that it is heavier than air so it will accumulate in a low point. The West Marine tanks are designed to be installed in a cockpit locker and vent into the cockpit. From the cockpit the gas will vent through the cockpit scuppers. If you install a propane tank and the low point is the bilge there is some risk that you will blow up the boat if you have a leak. I believe propane systems have a solenoid which will shut down the system if a leak is detected but I don’t think these help in the case of a leak before the solenoid.
You could probably build a locker which would do the same thing the West insert would do but your insurance company may not like this concept. If done right, it would work but they don’t know that you would do it right.
I have a Tartan 34 C and am looking at upgrading the galley at some point in the future. I don’t really have a good place to mount the tanks so I am contemplating using a diesel stove. They are expensive and as I understand it, they may be sensitive to the voltage in the battery banks but it would eliminate the need for a propane tank.