Take them off, put a rack on it (like a CJDesigns) and then put handles on that if needed. The only pillion I've had in many years is my daughter and she uses the belt on my riding jacket(s) so I'm guessing here. You might also consider luggage mounts like Back Roads Moto (he makes Wolf's racks) or possibly the Givi. There may be enough of a handhold for your SO to use.
"For those who fight for it life has a flavor the protected never know."
USMC 65-68 RVN 66-67