The classic Conrad Johnson Motif MC-8 FET preamp has exactly that. It has two completely separate phono inputs; one high MC, the other low MM. It has two tape loops. It has two pre-outs (for two amplifiers). It also has two regular line level inputs. It sold for about $1000 more than the MC-9 that was the same with no phono, so the phono stages are first rate. If that phono stage has been in a separate box the price would have been a lot higher.
I own two MC-8. One is in my home office system, the other is in the closet since I have no place for it currently.