hi I cut and shut the mx5 loom (mk2.5) as there were so many cross wires I decided it was so much easier to pick up the stalk wires and rewire from there .
I'm trying to remember how I did it but from the dim and dark recesses, and there is probably a much easier way !!!!
I ran the ignition feed to the relay then to the stalk which obviously then feeds either side, I used a second relay with a permanent live feed , relay to the hazard switch (rdx has 2 sides so that the indicator signal does not cross) wired into the indicator wires.
hope that makes some kind of sense, basically I have 2 circuits feeding into the indicator wiring, 1 perm live (hazards) 1 ign live (indicators) not sure how to do it if using the mx5 hazard switch.
I would try replacing the indicator relay first and see what happens from there regarding the hazard function, I guess you could put a diode (one way current) in hazard to indicator wiring if you have to rewire this would stop any cross feeding when using the indicators.
remember we are not mad just creatively insane