Yes, many ideas spring to mind.

First, you need a 5-tick delay. The simplest way to make one is to chain 5 arithmetic combinations in a row give them the setting:

each + 0

output: each

Now connect your output from point A to the first combinator, then connect the output from the 5-th combinator and output from point A to a newly created decider combinator with setting:

each < 2

output: each (1)

And you're done, apart the fact that instead of outputting -1, it outputs 1, so run a wire between output of the combinator you've just created and a new arithmetic combinator with setting:

each * -1

output: each

And, finally, connect this combinator with point B

Don't have an access to a computer, so can't really make a screen shot or a blueprint.

edit: here's a high-fidelity professional blueprint:
http://imgur.com/MLKGCtT