Build a coalition of people who work in various departments, legal, marketing, research, etc. with enough momentum that could be enough to earn the credibility required.
Another possibility is straight up democratic voting. These large investments place the company in financial peril, so maybe everyone should have a day.
There are many ways to organize, hierarchical top-down control is useful but overused.
The CEO can. Not always ideal to have the CEO deciding the restroom soap budget, but if it's not delegated to someone else, it's up to the CEO. Keeping the company running is literally their job.
Another possibility is straight up democratic voting. These large investments place the company in financial peril, so maybe everyone should have a day.
There are many ways to organize, hierarchical top-down control is useful but overused.