Home theatre passs through should work if your preamp has one.
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I use my Sunfire theatergrand with my Linn Axis turntable in that way. My tubed Audioprism pre-amp does not have phono pre-amp...the tape out on the Sunfire works fine and sounds great.
The tape out idea does not work for multichannel though because as you stated, no volume control along with other problems.
Jond has the right idea for multichannel if you have (pass through) on the second pre-amp. If you do not then you can use (unity gain method) which means any (AUX) input will work with the second pre's volume set at mid-point or so.