HITL with more than 8 PWM outputs possible?

I’m currently trying to verify my setup by using a HITL simulation. It’s a hexarotor VTOL with four flaps so in total I would need 11 PWM outs. Currently it seems that HITL is limited 8 PWM outputs. Is there a workaround?

Als also I’m using gazebo sim (Garden release) where I cannot find documentation on how to use gazebo sim for HITL simulation. Does someone know how to do it in that case?

Thanks for your help!