I have a McIntosh SS amp and preamp and Decware Signature Monoblocks, matching CSP all upgraded to 25th Anniversary+ specs and a Mapletree tube phono stage. I listen to both depending on the music genre. Your McIntosh system is “Holy Grail” level. To second rivington66, I predict you may never be satisfied with an SS system. Your system has a signature “sound”. I do understand the desire to downsize (I’m U.S. Social Security age plus five). I’d miss the warmth and esthetics. However, that’s me.
As much as I love my Decware system, it sent me down the path of mods and a matching switch box, a matching “magic box” that actually allows midrange/bass adjustments, and a new Decware phono stage (still two years away, so that may change). They do make a few integrated amps (no phono stage); however, they have a myriad of different tubes to replace if necessary.
Another experience: A few years ago, I seriously considered a new turntable to replace my late 1970s Kenwood 500 (15kg) with Black Widow ToneArm (graphite) and Grado Sonata 3 cartridge. I asked for suggestions; one third of the replies were “Why?”. I had the wiring replaced with Cardas Litz and added new isolation feet. It sounds lovely. I spent the total turntable replacement cost on the phono stage and lots of albums.
Best wishes on whatever you decide. Enjoy the music.