Go ahead,no worry.Most of the nut slots are able to cater hard tension strings.
I've been using D'Addario nylon strings most of the time.The third string will be slightly thicker in diameter,sometimes could give you intonation problem.You can try the EJ46 C, the composite 3rd string is slightly thinner,hold the tune better than nylon 3rd.But sometimes I find it overshadows the E and B strings, just control your finger while plucking the G when playing should be okay.
2017 Karel Dedain Spruce/Maple (Torres) 64cm
1998 Yamaha GD 10, Spruce/IRW 65cm
1988 Alhambra AL 8, Cedar/IRW 65cm