Here is an
example of a higher gravity Brew Demon recipe.
This one uses a can of HME, a can of UME, and the brew enhancer with a suggested ABV of 6.0.
For a higher ABV add another can of the HME (for more hop flavor) or UME (for maltier beer) or both (for much higher ABV).
I'd suggest using something like the
US-05 yeast. Although the packet is made for 5 gallon recipes it would be appropriate for a high gravity 2 gallon batch.
You will need to ferment longer, 3-4 weeks would not be a bad idea.
It may take longer to carbonate and longer aging would not hurt.
I'll suggest that would not be a bad place to start.