That’s called electrostatic fusion, and it’s what Philo Farnsworth was doing in the late sixties, and what Dr. Robert Forward spent his last days pursuing.
It’s still interesting though, and many high school kids have been doing fusion in their parent’s garage.
The most expensive part is the vacuum chamber, but I think we can salvage the concept as shown in the original post here.
Just set up the electrostatic fusion chamber as a maneuvering thruster, because outer space will provide the vacuum.