It's not entirely a blunder but OP should consider the MVP as almost a straw man. Don't be precious about how you've designed it and don't be shocked when customers say this is not at all what they need. Having a prototype could still be invaluable for eliciting feedback.
In fact, I'd open with a pitch along those lines. "I'm looking for feedback on a work in progress... gathering requirements, tweaking the workflow, that sort of thing. It's not something that you'd find useful right now, but if I could get some input based on your specific business needs/business model, I think we'd both find it valuable."
Without some kind of MP to show, whether it's V or not, all you're offering is hot air and wasted time. If they speak to you at all, the decisionmaker will want to know what makes you think you're qualified to develop the product. If you don't have an awesome answer for that, you're done.
Much better to have something that serves as a conversation piece, even if it's just a mockup.
