"Nice idea in theory, how do you do that in practice?"
I've no idea. I leave that to programmers.
"If an alt was purely defined as accounts set up with the same DOB, email address & signed into from the same computer or IP address, then yeah it could work, but I doubt that that is true for every case or that it wouldn`t be open to abuse."
I used the term "alts" but in fact there's no good reason why it shouldn't also apply to other people's accounts.
The only ethical justification for a No Transfer policy is to prevent the unscrupulous from copying and re-selling. This problem wouldn't apply where an entire inventory was transferred. Inevitably some vendors take advantage and apply both No Copy & No Transfer to their products. There is an argument that this shouldn't be allowed anyway.
Anaiya Arnold said
"I'm a bit confused about the point of starting a new account and transferring everything you own to it. That kind of makes it the same account with a different account name. I doubt the Lab will devote resources to coding that feature, and suspect their advice would be to settle for a different display name."
LL may well suggest that, but it's not the same, for reasons that on reflection will be apparent.
"It would be better to let us link accounts on the backend and share a single inventory (preferably accessible for basic editing on a web-page, especially move, copy, paste, delete, new folder), etc, but creators who sell multiple items to users who want one for each account would be a bit short-changed by this."
Excellent idea, and one I'd be happy to settle for. As to creators being "short changed"....it's easy to see all the interminable arguments for and against this. For my part, I resent having to buy the same item twice or thrice and have little sympathy as long as vendors can apply No Copy & No Transfer to the same item.