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Don't have access to a box right now to test it, but these changes should work:

1. Change the hashbang to #!/bin/bash (on my system /bin/sh is a link to bash). Or just change the [[ to a full if....

Well, I spent a couple of hours playing in sed and couldn't find a way - but then I'm not very good with sed!

I did manage to create a solution of sorts with awk.

It uses a csv containing the...

If you insists on using sed:
sed "/varx =/h
/vary = /{
G
s/\(.*vary = '\)[^']*\('.*\)\n.*varx = 'false'.*/\1NEW_VAL_1\2/
t # optional
s/\(.*vary = '\)[^']*\('.*\)\n.*varx =...

I'm not sure I understand your conditions. Is the ELSE ever going to be executed except at the start of the file (i.e. before we encounter the first varx assignment)?

Put another way, what output...