How to install blower motor relays??

I'm having a hard time coming up with a way to keep the existing 2 way wiring, one that goes through the A/C-Max A/C and the one that goes through the Heat/Def. Where I currently have my relay, just downstream of the L-M-H switch but before the 3 prong connector won't work when I put it on Heat/Def because the current is routed an entirely different way so that even on high, it goes through 1 of the resistor coils. The only way I can see it working is by splicing the heater switch wire into the A/C wire and just having a single L-M-H speeds instead of a Heat L-M-H and an A/C L-M-H. That is without using like 14 relays and having a convoluted mess of spaghetti.