Hi Ben ; Welcome to Permies! And Welcome to the wonderful world of rocket science!
I grew up in a 1950's 2 story wood framed house. It had a basement though so we had oil heat.
To start, I recommend going ahead and hooking into the municipal gas system.
Get a wall heater for it. Install it preferably near your
water pipes.
And then strive to never need it to turn on.
As a backup heat source, gas is a good steady alternative, much better than electric space
heaters.
Now
RMH's are awesome as a heat source.
With one, your gas usage will be tiny.
But like any single point heat system it will struggle to heat 1000 sq ft with 4 or 5 rooms tightly packed with many wall's.
Options are limited to fans moving the warm air throughout the house (sure to be chilly in back bedrooms)
Or if wood is easily available and
city regulations permit. Then a larger
RMH in the main room and tiny brick bell batchboxes in back bed rooms might be a good choice.
Tell us a little about your house layout.
Is there a crawl space underneath to have proper support for a larger RMH?
What about existing chimneys?
EDIT) I just reread your post and wanted to comment on the outdoor wood burner systems.
They work... BUT...
They require electricity to blow the air...
The real issue with them, is the nonstop huge clouds of smoke that will cover the area...
This is where a clean burning RMH really shines...
Nothing but steam or heat shimmers will be coming from your chimney!