Typically higher down payment and higher interest, but an option nonetheless. 

So, here's a vague response - go with the MOST EXPENSIVE option!

I know of a few options that don't require title seasoning for cash-out, but they are capped at 75% LTV

I know @Jake Baker is a great option if that's the route you decide to take 

There isn't going to be much of an opportunity to improve the value of a new build through a remodel so unless your discount is something along the lines of 20% or better, this may not be a good fit for the BRRRR strategy but that doesn't mean that it isn't a good opportunity for a different strategy.Just thinking out loud, maybe it could be a good fit for a lease option or rent to own play.

One popular option is multifamily syndication, which has a lot of potential for scaling up.

Option 3 is the most work but best return.  

Junking back here to see if there are any HELOC options now?

I will list a few options below, but the TLDR version is I may be able to help you with the Dispo side depending on the deal structure and comps.

It seems that the latter may be a better option from what you wrote.