Redefine True and False for Boolean and/or NullBoolean Fields?

As I understand, in Django/Python, True is 1 and False=0. And when
connected to the database, we use a TinyInt for that variable and
assign it to a NullBooleanField.

Problem is that some people use their PC's with a Microsoft Access
based front end to the database (MySQL). The forms use check-boxes,
and when checked, which is supposed be "true", Access puts -1 into the
data base. Django doesn't recognize that value as True.

I can't change the Access forms or system and don't tell me to stop
using Access. We don't have unlimited resources to fix all the
problems in the world!

I'm wondering if there is some way to tell Django in the data model to
let a model variable return True when <>0 (instead of when=1) , and
False when 0?

This seems the cleanest easiest way; but I can't see how to make this
possible? Is it? Or is there another approach ?

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