I've not tried Nashville tuning with nylon strings but I have strung up a 12 string guitar with them so encountered the same problem with the octave strings (which are tuned the same as Nashville).
For Nashville the high E and B are no problem obviously and the low E, A and D are OK because you can use a normal D, B and E string tuned to octave E, A and D
The problem is what to do with the octave G.
Two methods:
(1) D'Addario (I think) make monofilament nylon strings in a wide range of diameters so if you can source them you could use a string a little thinner than a normal E (the normal E is around 0.028 so something like a 0.024 or 0.025 would be OK
(2) use a high tension E string for the high E (and if you are going to do the Nashville tuning I would recommend you use high tension strings for the E B D A E strings) and a low tension E string for the octave G.
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