Jay,
A lot to unpack in your thread. So I am going to hit what stood out to me. Live edge slabs is a seller's market. Very hard to find and much sought after. Your best bet is to have a good internet catalog that documents each piece with dimensions, species and LOTs of photos. Welcome questions by having each piece hold an inventory number of stock number, so specifics can be clear for that particular piece. I don't think your going to find a formula, because they are not really a commodity. They are all unique one off pieces, unlike traditional dimensional lumber. There are hardwood lumber retailers in Houston and I believe Dallas that you might want to introduce yourself and project to. They are going to have customers inquiring about one of a kind projects; and may be able to sell for you if the arrangement is mutually beneficial.
Another outlet you might have luck with is custom builders. Most live slab demand comes from high end homes wanting a 'rustic' look for a mantle shelf, or beam. Custom contractors and builders need to know you are a source for them. The same is true with custom furniture makers. Get to know ones in your region and show them how easy it is for their clients to pick their own slab online for the creation of their one of a kind dining table, etc... They are craftsmen and want the convenience of not spending valuable time searching for materials rather than producing works.
Lastly, find the Rocker, woodcraft, high end wood working shops. They have bulletin boards to advertise businesses in their stores. Have fliers and cards. Again, this is a niche market. You have to find your customers where they traffic.
As far as replants, do some research on Paulowina. Here is a link:
Paulowina Association
It is a lightweight hardwood that grows very quickly. Harvest at 10 years and have regrowth ready in another 5 years. Was once highly prized in Asia, but seems to be waning, as they want slower growth/higher density pieces for their heirloom projects. However, if one had a supply of domestic lumber; one could get into the high strength composite movement that is developing. Carbon fiber and Basalt fiber are growing in use as people discover the applications over more traditional aluminum structures.
It is also reported to be a high carbon sequestering tree. Makes great tasting honey and grows back from pollard faster than most pine and pulp species. If you have 25 years or so to wait for harvest then black cherry and black walnut will be better choices, as they are always in high demand.