If this property is historical in the sense that it is on or may be placed on a historical register, the renovation project will also have to conform to a set of conditions that will generally have to do with maintaining all or significant portions of existing architectural elements such as facades, building materials and colors.Historical or not, any planned project will have to be heavily vetted in terms of existing conditions and projected uses for all major building elements such as structural, electrical, plumbing, mechanical and ADA and ANSI provisions.

Up to 85% (or less) of Social Security feeds into taxable income based on combined income formula.  

Combine that with everything from the first BRRRR and the information begins to compound.

@Michael Gelatt I am giving these answers according to mortgage point of view, you have to contact your CPA for other concerns.1 You should be paying from your business account to keep it separate.2 You should combined both to cash out because you are refinancing any way. 

Is anyone in the area currently combining FIRE techniques (accelerated saving, index fund investing, etc.) with RE investing simultaneously?

If you try to combine a refi followed closely by a sale and 1031 the IRS have many times interpreted that as a way of taking profit out of the 1031. 

I'd suggest you form your own opinions of course :)  1) Kelowna: Has a strong rental market, but It may be tough to find strong cash flow on a property with only one suite.  2) Kelowna: The summer Short term rental combined with Off season student rental combination is making folks big cash flow right now, but it is growing more competitive.  3) BC: I second the comment made by @Brianne H.4) Vernon:  If you spend the time to look you can find deals here  5) Have good Math

Is it possible to combine the FHA 203k and the BRRRR strategy?

Monthly rental incomes are almost double the PITI combined...

Then work all avenues to secure the financing, in all combinations.