and the spaceship tech owner can just use that money to build and implement clean energy solutions to revert climate change, and never really need to build the actual spaceships..
This is like asking if one would pay more taxes, where it is unclear how the tax will be used to improve common good.
I bet if you ask people if they are willing to pay $1000 dollars (financed as $40/m in 25 months) to secure a spaceship ticket to escape the failing earth climate (assuming the spaceship already exists), many people will happily pay it.