Is it possible to allow Integer Overflow in Excel VBA?

Pretty simple, but I couldn't find anything by Googling. An example of what I want to happen:

Function myFunc()
    Dim a As Integer
    Dim b As Integer
    Dim c As Integer

    a = 20000
    b = 15000
    c = a + b

    myFunc = c
End Function

I want myFunc() to return -30536 instead of throwing an overflow exception. I know I could write a function that does that, but I've written a bunch of code for a project with the assumption that overflow was allowed, so I'm hoping there's a quick fix.

EDIT: I don't need help coming up with a function that solves the overflow issue with type conversions. I have one already; I just want to avoid changing hundreds of addition and subtraction operations. I'm also bit frustrated that VBA seems to go out of its way to disable overflow functionality--it should let the user decide if they want to use it or not.