This is the opportunity to write a wish list

The issue is that the goal of buying the license isn't to keep the project healthy but to get access to the software. While you can charge for a license there is nothing stopping someone else undercutting you unless you add something extra like maintenance.

When governments (within the EU) give out grants to (for example) keep industries alive it normally comes with quiet a few strings attached and requires some feedback or proof of what it is going towards.