Your system(s) is not as simple as you've indicated. Recommend you set aside the surround system for movies only. Two channel is where it's at for vinyl playback.
That leaves you with the Outlaw receiver and two turntables: a vintage Franken-Thorens and a newer VPI. If you like having two turntables, hook them both up to the Outlaw receiver for now. Use the MM (moving magnet) phono input for the Thorens. Buy a $125 Schiit Mani phono stage for the VPI. The Mani can accept either moving magnet or moving coil cartridges, and it it's very good for the money. It's easy to attach the Mani to your Outlaw by connecting it to an AUX or other line level input. Set up this way, you can shuffle between the two turntables and maybe swap cartridges around to see which one you like better and which turntable you like better. You can also test the Mani against the built-in phono stage in the Outlaw. I'll bet that the Mani will be superior. I also have a hunch you'll like the VPI set up somewhat more than the Thorens, but you never know, right? Then sell the turntable that is lesser, or for fun get a mono cartridge (if you have mono records) and use it on the lesser turntable as a dedicated mono rig alongside the other turntable that is set up for stereo.
That leaves you with the Outlaw receiver and two turntables: a vintage Franken-Thorens and a newer VPI. If you like having two turntables, hook them both up to the Outlaw receiver for now. Use the MM (moving magnet) phono input for the Thorens. Buy a $125 Schiit Mani phono stage for the VPI. The Mani can accept either moving magnet or moving coil cartridges, and it it's very good for the money. It's easy to attach the Mani to your Outlaw by connecting it to an AUX or other line level input. Set up this way, you can shuffle between the two turntables and maybe swap cartridges around to see which one you like better and which turntable you like better. You can also test the Mani against the built-in phono stage in the Outlaw. I'll bet that the Mani will be superior. I also have a hunch you'll like the VPI set up somewhat more than the Thorens, but you never know, right? Then sell the turntable that is lesser, or for fun get a mono cartridge (if you have mono records) and use it on the lesser turntable as a dedicated mono rig alongside the other turntable that is set up for stereo.