1. Thin, wicking, post assembly, loctite. Works, but, you may have issues ever truing the wheel in the future.
2. I've heard of mechanics crimping the nipples slightly with a pair of smooth jawed pliers. Not what I would recommend but may work.
3. Thinner gauge NDS spokes for the additional elongation and subsequent recovery before going slack. My currently prefered option when spec'ing components to start with.
4. Wheelsmith spoke prep. I use the stuff sparingly. It seems to help with both decreasing spoke wind up and discouraging NDS nipples from loosening.
5. I have a block of bee's wax I intend to trial. Some builders seem to have good luck with the stuff.
6. Boiled linseed oil, I haven't used. But, I have an old pair of Nisi's laced to record hubs, built by an old Italian mechanic in the early 80's who utilized just that and they remained true over many thousands of miles before the becam wall orniments.

I don't know your bracing angle. But, on 700c road wheels, even at 115kg of rider weight, if I can achieve 70kgf of NDS tension mine don't back off (using standard 14/15 db spokes). Sub 60 or so and I start experiencing issues. YMMV