I also use other preamps just for the phono stage. Works just fine.For my Kuzma Stabi/Sogi S I use an Audio Research Sp-15, for the Rega P5 I use an Audible Illusions 3A. MY main preamp is Bryston BP-26.
If you like the sound, there is no need to change anything.
If you like the sound, there is no need to change anything.