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That is really too bad, because almost everything is bash-specific in my script. Unfortunately I have no prerequisites to help you further. I could rewrite it in perl, if it's an option.

You could try this instead, which is a translation of junior-helper's "restore" bash 4 code into more universal shell code and should run in any POSIX compliant shell, including bash and ksh:
...

Change your awk backup so it saves the rest of the default: line
awk '/default:/ {sub (/.*default/,""); sub (/,.*/,","); print}' config.json >defOr with sed
sed '/default:/!d; s/.*default//;...

Following might work for you:

"Save" default values
$ grep default: config.json >def"Restore" script:
#!/bin/bash

#following command requires bash 4
readarray -t arr <def
index=0
...