Indoorse project provide an ability for all their community to choose experts from ordinary users. You said, that you are going to moderate them more or less manually, but what do you think about this possibility? Assuming you`ve got all this security protocols against bots.
We are not exactly going to moderate who can become an Expert - we will just invite famous Expert onto the platform at its start.
As for the bots - it is actually a pretty sophisticated problem. We will utilize a combination of automated detection measures and curation from high-rating Expert to filter them out.