Running a preamp into another preamp

Ok guys, so I am trying to figure out a way to play my guitar and my keyboard (not at the same time) through my stereo system, while music is playing through the same speakers/headphones. Playing through another amp is nice but I really want to feel like I am right in the mix, would be a lot more fun and pleasant.
So here is my plan... Run my guitar/keyboard into a revv d20 guitar amp (probably on the 4 watt setting?), out through a balanced xlr, into an Oppo HA-1, out with rca into sony e9000es preamp, now this preamp has a multi-source option to play two sound sources at the same time, so I’ll have cd/aux/tuner playing at the same time as the input of the instrument signal coming from the ha-1, and all this run through the accompanying sony n9000es, unless I’m using headphones straight through the e-9000es. And if you’re curious I’ll be playing it through some old jbl 940’s, some big honkin 4 way speakers.

What do you think? Bad idea? Good way to blow something up? Weak links? I imagine I’d run the risk of damaging some of the equipment, which is maybe ok with the Sony e9000es, I have a back up, but not the ha-1... I don’t want to risk that. Should I just find some kind of converter to go rca straight into the Sony? I’d imagine those things would sacrifices bit of sound quality. Is this all just a big pipe dream? Suggestions for alternatives definitely welcome, thank you.

edit: By the way, the guitar amp has an ‘internal load’ setting to be used without speakers, which basically makes it act as an audio interface, and sends a digital signal, so it’s not like running an actual tube amp into my ha-1 lol