Monitors secure on stands

I ordered a new pair of Dynaudio Focus 140's and matching stands. They should be in early next week. Unlike the Paradigm Studio 40 v.3's that I am replacing the 140's do not fasten to the stands. We regularly have small children visiting so having speakers secured to the stands gives me peace of mind.
I have a friend that is an excellent wood worker who says he can install threaded inserts in the bottom of the 140's. I can then drill holes in the top plate of the stands to fasten them.
Will this lessen the resale value of the speakers when upgrade time rolls around? Any other good suggestions?