YIf you finally got your dream speakers keep them!
i’d get rid of the Sony receiver. Not being able to use the Bose EQ is a deal breaker. The onboard “toys” destroy definition and and crush dynamic range. The 901s don’t stand a chance to sound like ... 901s.
See if you can get your hands on a good “old school” receiver or separates and give them a good listen before you give up on your dream.