Can’t comment on how they play with the classic rack, but the cyclo loops put a bag ever so slightly lower than on a brooks, so imagine it’d be ok, maybe angled a little bit down overall?
The rack has a bar that rests against the saddle rails though so if its too low then that might not sit in the right place.
Unless it's miles clear, inner tube or whatever wrapped round the bar of the rack (or alternatively round the saddle rails) as a spacer should get it in the right place.
Can’t comment on how they play with the classic rack, but the cyclo loops put a bag ever so slightly lower than on a brooks, so imagine it’d be ok, maybe angled a little bit down overall?