For under $100 you can get an Amazon Echo and a patch cable that connects to your Linn's Auxiliary input. If you're an Amazon Prime member, youre almost done. Use the Amazon Music App to connect Amazon Music as your source. For a $99 annual upgrade fee, you get Amazon Music Unlimited and access to 100 Million songs, plus podcasts, and one free book a month from Audible, all in CD or better than CD quality. All with the best voice control on the market. You can also connect to other streaming services, if you wish.
The perfectionists on this forum will be *shocked* at this recommendation, but im also sure they haven't tried it. The integration is very effortless, and you may be able to add a switched outlet to give you power on/off for the amp. The Echo itself can support any streaming speed Amazon Music supports, up to 24-bit 192 Kbps, over 4X faster than CD quality requires.
Feel free to spend on the WIIM and Bluesound equipment. both are very high quality solutions, but voice control is going to be a challenge. I own a Bluesound Node, and voice control is not, to my knowledge, supported. WIIM does support Alexa, but you still need an Echo for microphones and to act as a control hub.
Personally, I would start simply, with just an Echo. Then, if you feel the need to upgrade, consider the WIIM Pro Plus.