A company that delivers essentially what the neural imagos in A Memory Called Empire provide, but without the neural interface, which is not really essential.
That breaks down to;
a GPT-3 or better linguistic simulation of a person, derived from their own writings and conversation, recorded over their lifespan, and serving as a simulated version of themself after they are dead.
UI technology that isn't neural – say, uses subvocalization and similar channels. So you can have an internal conversation with this thing; not that different from an imaginary conversation with a purely natural-brain imago.
A business plan that deals with the problem that it takes a long time to gather the data. (In my case I have a shitload of writing I could use)
Marketing: think of selling this as a form of insurance, the sort of prudent and responsible thing someone would do to ensure that his dependents are taken care of after they are gone.
We sell you the voices that are already in your head...