As an advisor who used to previously work in the mortgage industry, I would be surprised if many registered investment advisors know what a recast is.
Those also are 3 topics that require a lot of background info to provide a response worth any weight.
My advice would be to heed caution to any recommendations on this forum (finance related) unless it’s from a fiduciary who is your personal trusted advisor.
The problem I see with recasting is all your cash is then used up in equity which is valuable, but it's not cash without another loan or selling. Recasting will just lower your monthly payment. I did what wapitibob, suggested and went the HELOC route. You'll pay a little higher % rate, with the HELOC, but there aren't any closing costs (mine was $0 out of pocket, including title work, appraisals, or underwriting), and you only pay on what you draw, not the entire loan, like you would with a traditional loan. The problem with my HELOC is it's variable rate which has been set at 3.5% since I got the loan in 2018. I don't foresee it rising in the near term and if it does I have the cash to pay it off anyway, but if that were to happen I loose the ability to draw on the equity. I believe at the time of closing I could have locked in my rate at slightly higher rate, but I elected to take the gamble.
If you do elect to put all your cash into equity on properties and you ever need to exchange for cash, you'll have plenty of lenders who would love to charge you points, closing costs, title work, appraisals, etc. to do a traditional refi or realtors to sell your property.