Any HDMI switch with an optical output would work. There are dozens to look at on Amazon and other places, pick one that suits your budget. Or, if you wanted to do Atmos, either the FD Fury Arcana or the Feintech (model number/name I forget) would work, although substantially more expensive. 

According to https://www.philips.ca/c-p/46PFL3706_F7/117cm-46-inch-class-full-hd-1080p-digital-tv the TV does have a coaxial output. I have no experience with this, but coaxial to optical converters are available. Here’s an example: https://www.amazon.com/Optical-Converter-Bi-Directional-Repeater-ROOFULL/dp/B01N32C5GT

You could then use the optical to HDMI adaptor Sonos provides.