I find it much more intelligible to just do the work directly myself.One thing I'm really not sure of (but would like to know).... is how far is the Flat Fee MLS broker's "reach" over my ability to sell thru alternative avenues outside the MLS listing service that I'm paying them to list on??? 

It would be a good idea to review your specific situation with a CPA experienced in real estate investing.

I have a goal of acquiring my second rental property in 2024, specifically a house hack.

The same holds true for investment properties as they do any loan, with regard to when you closing and not having to making a payment for a specific period of time.

I believe that this is specific to California.  

Are there private money lenders who do cash out refinancing deals as an alternative?

Unless there is a specific reason to communicate there is no reason to.

From what I hear on the recent podcast 710 it's a great alternative to short-term rentals but a lot of leg work to get licensed and set up. 

I'm specifically looking at the Pro version to get all of the functionality.  

1/4 drywall over popcorn ceilings and wallpaperMudjacking can be an alternative to replacing concrete in some cases.Resurface old tile, tubs, and countertops if they're in good shapeDefinitely vinyl plank in rentalsNew scratch and dent appliances, if you can find them.Amazon for pretty much all plumbing and electrical fixturesRip down  3/8 plywood for cheap shiplap.Using contractors who are budget conscience can save a ton.