I am on the same page as you, like sweeter wines. However I haven’t found a good way to do it.
* fermentations seem to double speed for every 10C, ex at 85F I have had 3 days, this will however stop at the high temp limit of the yeast where it dies, , , now that said you can stop a fermentor by raising the temp to where the yeast dies.
* a business will chill and add metabisulphite and filter at 0.5 micron.
* as others have said sorbate doesn’t kill yeast.
Till we come up with a simple home trick I wait, and after 10 months backsweeten.