My 2 channel HT system integration goal is great 2 channel, good enough HT.
Vantas S50A - It has an HT processor, sub out and 3 channel amp. The front R/L output is sent to my system through my preamp input so my main speakers (ProAc monitors or LRS depending on my mood) are my fronts. I have B&W Rock Solid Monitors for rears mounted on the ceiling and B&W CC6 S2 center. I have a Rythmic 15 in sub that is used for music and HT. I have to turn the sub volume up for HT.
Through the Vantas the volume tracks with my main amp as well so my 2 channel preamp controls the whole HT set up. The only issue is that Vantas went belly up so the HT decoder is a few generations out of date.
No HT equipment is in my 2 channel signal path.
The HT system is far from SOTA, but makes great movie nights.