(Pseudo-code) evilness using experimental regexp features might look like:
$TABLE='a'; #or whatever the default set is
s/(?:\x1B([abcs])(?{$TABLE=$^N}))?(.)/${$TABLE}{$2}/e
To simplify your table you could expand the RHS to include an ||$2.
Mmmm symbolic references.
UPDATE:
You could of course "legitimize" that and use $TABLES{$TABLE}->{$2}
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