KTM-9 is urethane based, so it's actually a poly type finish. If applied correctly the feel of it is close to nitro, but finish coat thickness is very important - but that goes for any finish - nitro, too.
Satin KTM-9 can be an alternative.
As a luthier, I'm not happy with nitro cellulose lacquer to say the least of it. Straight from the liver, I hate it!!
With (products like) KTM-9 available, I'll no longer play hazard with my health to satifisy my customers lust for nitro finishes.
;)