I have done this several times in my life - it's amazing when two people, willing to do literally any job that is needed, get together. Pretty powerful combination.
Maybe something like retaining 25% of their time for your projects could work. If you need more than 25% of a person's time, then maybe find two people with different skillets (although coordinating could be more difficult).
1. I had my own consulting business (small, 2 of us plus some outsourced support). I didn't like the sales part of the business. Met a client who loved selling and needed support in other areas. I wrapped up my business and took a role as it was more focused on what I love.
2. Currently working with an individual whose business closed during Covid. They think at a high level and are helping with BA work, documentation, client comms etc. It's not so much a hire/employee and more an understanding that they can add value with less direction. They get paid a contract rate.