VTOL Duo Tailsitter: actuators (motors) on AUX port, possible?

To maintain compatibility with other AP systems I would like to be able to use this actuator mapping in my non-vectored tailsitter, if possible:

MAIN5: elevon left
MAIN6: elevon right
AUX1: motor left
AUX2: motor right

I’m trying to understand how to do it but I do not find exhaustive documentation about it (if is possible, obviously without putting my hands to the code.).
All work fine here with the standard common output, so:

MAIN1: motor right
MAIN2: motor left
MAIN5: elevon right
MAIN6: elevon left

Hi, I am in a similar situation, how can I solve?
I need to map the motors on the aux ports, how should I make the file to be inserted in the SD?

Thank you so much

Did you see https://dev.px4.io/master/en/concept/mixing.html#loading-a-custom-mixer ?

@hamishwillee could you please put me on the right direction if possible?
Standard Tailsitter Duo, I should keep these harnesses:

MAIN5: elevon left
MAIN6: elevon right
AUX1: motor left
AUX2: motor right

I tried to create a mixer table but unfortunately either the motors work by setting SYS_IO to 0 or the servos by setting it to 1, never together.
Isn’t there a chance to make them work so connected?
And anyway the motor correct in reverse, as the PX4 expects the right as MOTOR 1.
I see that the dodecacopter works with PX4, and inevitably it uses both MAIN and AUX