mathematica result problem

Hi.

I have following problem:

In some calculations I use an interpolation such like this:

li=Interpolation[{{0,0},{1,1},{2,2},{3,3},{4,4},{5,5},{6,6},{7,5},{ 8,4},{9,3},{10,2},{11,1},{12,0}},PeriodicInterpola tion->True,InterpolationOrder->1]

I use it to simplify results of matrix operations, for example Kronecker Product of matrices like this

is "Kab = KroneckerProduct[A, B]":

but I prefer to simplify it with interpolating function shown above to "[li[Kab]]"

So, the problem appears when I try to use matrices like this:

The result is as follows:

Is there a possibility to change a way of interpretation of symbol "I"? So, to obtain a result without information "InterpolatingFunction", etc...:

And so, could I change it for all symbols, like "x", "a", etc.?

Thanks for all help.