Just to follow up with my own thread. I'll keep who suggested it private but someone gave me a lead on using Discover for a HELOC. Tentatively approved just waiting for underwriting to review my docs - they're reviewing me for $300k (max amt) for 30 years @ 6.650% APR.  I'll likely cover whatever isn't provided by this 300k by direct corn sales but it should substantially lower cap gains sales and delay corn sales as much as possible.

Thanks to everyone who chimed in with suggestions.