I was going to test that today - creating a web service caller to send over path and ticket info to a custom-made decision project with the incident-mgmt service id. from what i've heard and read (thanks to liaison Alex Hedley for much information), the service id issues lie within task calls and tables. well, if there are no tasks involved (decision only, simple ruleset calls and exit), then i don't see where a collision could occur.
warnings and cautions and risks of implosion and catastrophe duly noted, of course.
although if anything goes wrong, i'm going to tell everyone that michael george told me it was 100% safe and that his seal of guarantee is on the solution.