I think a single disk RAID-0 is the only option. There's nothing necessarily "wrong" with that, so not sure why you think it is "messy"...
It is a bit messy though, and has the important disadvantage that you cannot replace a drive and expect a software array to rebuild automatically. You have to again create a new RAID0 array, then assign it back into the software array. A 'proper' passthrough/JBOD card avoids this.
A better bet if you want software RAID would be something like a SAS 6/iR or AOC-SASLP-MV8 or similar - they will do proper passthrough, and are cheaper than the PERCs. They don't do RAID5/6/50/60 though.