What you ask isn’t unreasonable: You wish to add sockets to items that typically cannot be socketed using the cube by having a way to “Larzuk” items.
The issue here isn’t what you’re asking, but the price your implementing it. Gold is far too easy to obtain in this game to simply “Larzuk” such items.
Such request should be far more costly. If such idea would ever come to be (which I wouldn’t be opposed. I’d even allow the idea to random mutiple sockets in rares/uniques with lower chances to roll high since it would technically be a big buff to rares/uniques.) it would have to be costly. Gold is far too cheap for what you’re requesting, you need real currency: Gems and/or runes; you should need a cube recipe.