The trouble is, the people who believe that this is possible aren’t going to read through this long post with all the numbers in it.
tl;dr: Here is what those people need to be told is this:
“Look at all the fuel that went into that Saturn V moon rocket — it took that much to get three guys and a ton of lander/orbiter to the moon. If it takes that much fuel for every ton of garbage we need to get rid of…”
CAVEAT: Unless they claim that the moon landing never happened…then, all hope of convincing them is lost.