This is just from my own experience, prolly not what real coaches do, but here goes.
I usually do all the kettlebelling the same day as I do my powerlifting training, though at the moment I’m not concentrating on conditioning and I’m pretty much doing just similar rep/set scheme as with my powerlifting training, but in the past I did it. I noticed that if I train powerlifting the first day, kettlebelling the next, and powerlifting again the third day that the kettlebelling eats up a bit from the day after.
Thus I do both the first day, nothing the second or perhaps some light cardio and start from the beginning again on the third day. This way you still get two nights of recovery in between the training (I’m doing full body workouts) and you can train hard again.
I don’t know if this is the best way if you want to really concentrate on conditioning, but if you’re like me so that the conditioning isn’t your top priority unlike strength training, it might be worth testing.
So, you might try out doing two kettlebell sessions the same day you do squat/deadlift.