Negotiate search fund stake as operating partner

We are currently searching for a small business with at least $400k SDE in the medical or construction service industry.

Even though I will be putting down around 5% of the purchase price, I will be the operating partner and will be funding the entire due diligence process. While my partner will function as a passive investor with little oversight.

What are some best practices to negotiate a 50% stake in a search fund if I have virtually no money for a down payment compared to my partner?

I have heard about several models such as traditional 8-8-8, RSU, class, option, and stock.

Any help is appreciated, Thank you.