War Caster feat + reach weapon can I use a spell instead of the weapon if they move to 15 ft? ?

@henryhiggins47if I have the war caster feat and a reach weapon can I use a spell instead of the weapon if they move to 15 ft? The intent is that any OA triggered because you're wielding a polearm is then made with that polearm. @mikemearls

— Jeremy Crawford (@JeremyECrawford) March 23, 2015

@andy_striemerwhy invoke intent with polearm master but not on previous answer-Crossbow Expert 2nd bullet applying to not just crossbows? Crossbow Expert works as intended.

— Jeremy Crawford (@JeremyECrawford) September 16, 2016