When symbols are non-commutative they will always appear with negative exponent:
>>> var('A B', commutative=False)
>>> 1/A/B
A**(-1)*B**(-1)
Beyond this, I'm not sure of an option other than symbol-trickery (or
writing your won printer):
>>> a=symbols('(-1)')
>>> y**a
y**(-1)
.c
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