Also, https://en.wikipedia.org/wiki/Genetic_code#Alternative_genetic_codes https://en.wikipedia.org/wiki/Genetic_code#Alternative_genet... Although most (all?)

Also, https://en.wikipedia.org/wiki/Genetic_code#Alternative_genetic_codes https://en.wikipedia.org/wiki/Genetic_code#Alternative_genet... Although most (all?) of the variability is in the one place you can make it without almost-certainly killing your host organism - in repurposing the STOP codons. There are usually three (and likely UGG was a fourth before it got hijacked by Tryptophan in the before time) and all you need is one.