Re: PCs fading away...
Would a back-of-monitor VESA mounting kit for a Pi do instead of DIYing with a Dremel?
That's handy, because there are a selection already available. Search and enjoy.
You'll not get the co-operation of the TV builders in terms of building a standard "smart module" connector, not least because Pi shows that the £100+ premium that TV suppliers (used to?) charge for a poorly performing "Smart TV" was/is a total ripoff.