Using nuts in pavlova meringue
A meringue with nuts in it is called a "japonaise".  If you search this, you will see many different recipes for a nutty meringue.  All meringues are crunchy in the beginning but become moist when left out or filled, provided they are properly cooked in the beginning.  I wouldn't worry about the texture as long as you use the meringues right away or store them properly (wrapped air tight and in a dry place - NO HUMIDITY).