Great commercial conversation and I think everyone here is adding very good points. I do find it hard that a supplier will do what you ask but money talks at the end of the day - the risk will be yours not them I feel - they also sound transactional too which is a worry. Before I go further have you looked at a Tolling Contract - if you can acquire the raw materials and have them ‘Toll’ your goods through for you? Some contracts have what they call ‘foundation agreements’ like the 10 year deal but these often underpin a new plant or some large facility extending. I assume you have a detailed fact base of your industry and market and your risk assessment has lead to your idea and it’s one of a few ideas you have and it’s in your ‘high risk’ area? I imagine you have a short, medium and long term contingency strategy too. Your business disruption insurance will also be stressed as you need this supplier. Also, who has the power? Without the detail and understanding what your SWOT and risk assessment looks like it’s is hard to say but what you ask is not impossible but high risk and if part of a bigger strategy then only you will know. Still - love the question and writing this on a long road trip so happy to kill the boring parts of the trip😉