middle of nowhere,
Welcome to the forums. For one of only 16 you sound experienced in this stuff well beyond your years. It sounds like Troy in Lethbridge may be the best geographically that we here are aware of to help you with a Listreroid engine.
Do not discount the use of a Chinese diesel. These well built cast iron engines are really easy to work on. They are cheaper to ship, make the same fuel economy or better than a Listeroid, cost considerably less per horsepower and are available in power ranges up to 30 HP for a big single. You can run them successfully direct drive at 1800 RPM to your gen head where you will get good economy and longer engine life. Parts and engines are readily avaiilable in Canada. Check this url,
www.altopro.ca Pat is a good dude.
Like the Lister/oid they can be set up co-gen to capture the valuable coolant heat in a thermosiphon setup.
If a 12 kW plant is the right size may I recommend a Changfa 1115, 20 HP@2200 RPM engine with electric start. Great engine! I plan to get one of these from Pat for off-grid application to power a workshop as a prime or backup to my 1.5 L VW Rabbit diesel genset. Reason being it is WAY easier to totally rebuild and WAY cheaper for parts than the VW for the same power at 1800 RPM.