Looks like I would need to separate "boxes" for this. One splitter for the preamp audio outs and one for speakers
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Regarding a line-level switchbox to go between your preamp and the two or three power amps, and assuming that all of the connections involved are single-ended (i.e., RCAs), I’ve had good results with the DB Systems model DBP-2JAU/5 ($110) listed near the top of this page. I've used it in a couple of different 2-in / 1-out applications, but it can also be used 1-in / 3-out among other ways. It is similar to the DBP-2J/5 for which a review and description are linked to, except that it has gold-plated jacks. For contact information go to their home page.
Another possibility, although it costs $359 plus options, is the Decware Zen Switchbox.
Good luck. Regards,
3 amps is tough. I see this one for two amps into one or two speakers:
I would use this between the preamp and amps (unfortunately, no longer made but can find used):