I think you need to break it out, and also set expectations on how you are going to present the 10 concepts. (who determines if your 10 are good or not?)
I would break it out and present them with 15 - 20 rough ideas(show them a sample of a rough concept), which will then get picked over with 10 remaining that I would then refine further(show them a sample of a refined concept).
Factor in 2 - 3 meetings. You could still do all this for the $2500 I would think and you in the end have a more refined process… sometimes you need to tell the client what they need and how it should be done in order to achieve the best results.
Chevis W.