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I manage to retrieve the bash completions within the script and make the completion mechanism from scratch. The completion function is then bind to TAB key which makes is callable in parallel with the read command, which represents the "with" prompt.
Since the options of "complete" and "compgen" commands are slightly different, it will be tricky to make the completions within the script 100% equal as in bash prompt. But still not impossible I think.
There are still some minor issues with the provided solution, but they are not critical.
EDIT: I've also fix a few other stuff along the road. I hope you find them valuable.