I'd need to understand what you mean by futarchy actually working here—the funding/governance stuff in that thread seemed pretty tangled. How would that shift things?
For example:
Create a market that asks something like "If project X gets funded, how many people will use it" for a bunch of projects, let people trade, fund the projects that traders think will be used
Create a market that asks something like "If project X gets funded, how many people will use it" for a bunch of projects, let people trade, fund the projects that traders think will be used