Two other quick thoughts. One is I think if people are struggling with costs, they really should explore a worfklow like OPs. Merely breaking up long running tasks by producing summaries / next steps and spinning up new agents off of them greatly reduces runtime costs. I'm regularly running out of time / mental energy these days than my $20 claude subscription, but I realize if I don't note share early and often, I can burn up the quota in 20 minutes. Its amazing the difference. Second is I feel encryption plays an important role. I feel like it is more important than merely keeping your own ideas private, and somehow impacts the generation and evolution of unique / diverse ideas _in general_.
Anyways, good luck OP, the use case is definitely there and important!