That too me sounds like its going to be a higher gravity beer than your thinking it'll be, approximately 1.057 starting gravity. Closer to 6.0% abv and really malty sweet. You may want to consider adding an additional oz. of saaz at the boil to have a better balance. Depending on your hops aau's...
I thought about doing the same thing with my burners, but I could not make it work fully automated. I decided to go with a standing pilot for simplicity. Thought about doing a intermittent pilot, then realized I would need a furnace module. And I'm sure you already know this, but you'll need low...
If you were running NG before, you should already have low pressure orifice's (orify)? I would guess.
I could be wrong, but I didn't think they would run NG at high pressure.