Why not 😅
But could you please update the logic (since not having sudo doesn't guarantee doas will be there) as well as make it more consistent with the other checks? Something like:

# Alias sudo to doas if found
if which doas &>/dev/null; then

Or change to check for both sudo's absence and doas existence if sudo should be preferred if available.

Fixed up the syntax. Also, if neither doas nor sudo is found, use good ol' su -c

The first "if" statement is broken. Please see my commit here for working code (which I also cleaned-up a bit to my own taste):
cshandley-uk@9aa529b