Truncate "change" list

When editing one produces changes. The '.' operation
will repeat the last change. What I want to to
be able to capture the current state of the change-list
(if such a thing exists), run a script which will make changes,
exit the script, and then if I type '.' have the change
that occurred just prior to running the script be the
change that is repeated.
Is this possible?

Thanks
Richard

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Quis custodiet ipsos custodes

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