You may [or maybe not] want to check out the CF-5A FM I did for the Paulopanz CF-5A package. You can get the FM here: https://combatace.com/forums/topic/88852-cf-5a_72-fm-beta-095/?tab=comments#comment-717562
There are quite a few data entries that can affect the roll response to rudder inputs but you can "probably" get what you want by playing around with the CLDC entry in the rudder section of the FM. Here's the data from my CF-5A FM with some info describing the various entries:
[Rudder]
SystemType=CONTROL_SURFACE
InputName=YAW_CONTROL
ReverseInput=TRUE
MaxDeflection=30.0
MinDeflection=-30.0
CDdc=0.0261..............Drag due to control surface deflection
Cydc=0.0662..............Side force due to control surface deflection
Cldc=0.006...............Roll moment due to control surface deflection
Cndc=-0.0441.............Yaw moment due to control surface deflection
When I did the FM I had access to a CF-5A flight manual and IIRC the type generated positive roll response [left rudder/left roll and vice versa] at positive AoA and the opposite at negative AoA. Typically for most types, the positive roll response would increase as the AoA was increased.