No, there is not, and there will not be: This module completely depends on what the underlying modules feature, and reading in chuncks is not an option in any of them. Well, maybe it is in Text::CSV_XS, but not without jumping through hoops.
The bottom line is that this module is a wrapper, and cannot really support difficult tasks if the real parser module does not support it.
FWIW the way you "formatted" your mail, made it end up in the spam queue on my provider side. Please take more care in writing next time you file a ticket.