Convolution by channel and different sample rate

[ditusade]

Hi Simon,
I have 2 wav convolution file by left/right channel and have music mostly in varying sample rates.
Is there a way to apply convolution by each channel? If not, is there any workaround I can use e.g import in REW then export again?
Also, is there any way to pass on multiple convolution files based on sample rate? I understand this could be done by upsampling everything then apply a fixed sample rate convolution. But I wanted to avoid that route in case the upsampling is done after the convolution.
Thanks