Nano sim is just a physically cut down Micro SIM. The chip is the same in all three sizes you can get.
You should be able to just get them to use the cutting tool to shop it down.
Better do not cut yours. Go to Orange and get Nano sim. Tell them you want it because of 4G LTE replacement. That way the change would be free (at least it was last month). Else, you pay like 50 pesos or so. Not worth to possibly damage your phone for 50 pesos. I still cannot gasp why Orange does not do 3-in-1 SIM as all operators in Europe now do. But hey, they now do 2-in-1 at least (big and micro), but nano is still a loner.