So @Mike S. is providing the perfect solution for you. 

I provide short term rental furnishing and renovation finish list that includes paint colors, light fixtures, cabinets etc.

I currently use Wells Fargo and it’s a pain in the butt to keep going there in person and setting up a security deposit account.

I'd recommend looking at costs. your build cost is going to be well over other homes because of the fixed costs like slab, Hvac, roof, etc. check the market drivers and weight the benefits of short term versus long term. long term is no furniture and help pays mortgage but at this size it doesn't really cover everything. we didn't find a lot of economies of scale in single family detached. can you build more than one unit?

We do well with ours in Denver and Colorado Springs, for instance.

It can be trained to provide an initial analysis but I agree, nothing replaces expertise and sound underwriting. 

RM-4.5 zoning would allow for a higher unit count and could provide more flexibility for future development, regardless of ADU policy changes.One potential benefit of rezoning before any citywide expansion is that it might allow you to lock in additional density rights ahead of any potential restrictions or revisions the city could impose when expanding the program.

My partner and I have a flip that we will be starting in mid march as well!

There are many other options as well including some that are included in property management software products. 

I've done a lot of value add as well so that helped speed up the process.