I have used my Naim 32.5 preamp with Hicap power supply, with other solid state amps with great success (quad 606, Classe). You do need a din to RCA interconnect with non Naim amps. But here is the cool thing. If you have another system (I have Rogue gear too), and not using the Naim preamp you can use the HI-cap , or other Naim power supply, to power a Naim stageline phono stage ($350 new) and have a phono section for your second system. I like this especially when switching between gear in the summer and winter. The hicap/stageline is great and you maximize the use of the hicap. FYI , my 32.5 also has phono boards. You also use the same din to RCA interconnect to connect the phono to you non-Naim linestage.
Now Naim amps with non-Naim preamps , no.
Don't be afraid of Naim in non-Naim systems. Hook up with a good dealer for help.