I think we have arrived at the same conclusion in that we need human reviewers. Almost everything else can be botted.
Take a look at my proposal. Maybe we can melt some ideas together and mutually agree on some key areas.
For example. We can have the proposer pay for the Reviewers, this payment will be part of the proposal cost. This way there is no out of pocket cost for Dfinity.
Initially this idea was only to siphon spam from valid proposals but we could take it a step further and have reviewers look for specific proposal requirements.
Let me know if you want to work together on this.