Thanks @Chris Seveney and @Andrew Postell for chiming in!
I really appreciate the suggestion to engage local RE investment groups with this question which I plan to do. Also the tips on how to navigate banks and getting routed in the right department for this type of query.
In a different post I saw another suggestion to engage any bank one is working with that has 1st position on the mortgages in the portfolio. I noticed I had several with Chase, unfortunately they discontinued their HELOC offerings since COVID... Their representative recommended I engage with JP Morgan Chase private banking / wealth advisor as they thought this would allow them to be more creative and include other assets as part of the collateral. I plan to check them out although I don't think they can be competitive for lending against equity vs alternatives like IBKR.
I will keep this thread posted as we navigate this in case others are interested.