My whole house audio runs off a product Google no longer makes unfortunately (Chromecast audios).
There's, no like-for-like new version, and no good replacement that I've found. Thankfully, this was a fixable problem and they fixed it vs. Just EOLing them.
Do WiiM Pro devices show up as speakers/streamable devices in apps (for casting) or can Google Home see them. Can they be assigned as the default speaker of a google home device?
I've got 11 CCAs in operation right now... That would be a pricey swap. Might be worth buying one and playing around. Also need to see if it supports yt music