used to do this for mix shows on college radio a long time ago - two 1200s going into standalone phono preamps going into a Soundcraft 200b - since this only had mono channels you had to fade a pair of channels at a time.
I remember mixing like that on PBS in Melbourne Australia before they got 1200’s.
They had these amazing Technics SP10 MK2 turntables with a start button wired into the desk when I have the time and the funds I want to get one of those decks and fit a nice tone arm with it.