I tried scriptc. Unfortunately, it doesn't work with this code at present (e.g., maps keyed by object and a number of various things). However, thanks for suggesting it. I have a note to revisit at some point.

Another option that appears to work well is to use Deno. I tried on my machine and it worked great. Only downside is the executable size is beefy. Could be about 70-105MB, or roughly 30MB compressed.

I don't know if that still sounds attractive? A 30MB download from Github, and then uncompressed to 100MB, and no other dependencies? (Most of it would be the Deno runtime, with only about 300KB being Reladraw)