Hi Steven, I agree with Peter in terms of looking within your network and recruiting people so it sounds exciting for them to participate. This part of the process is an artform in itself. Always keep looking for people to test and manage them in a CRM so you can go back to them for more feedback.
Secondly, you mentioned you are creating an MVP and want to recommend a better model for validating features and ideas than a single MVP.
Have you tried "pretotyping" methods?