Nixon, who will turn 20 during his spell at the Jakemans Community Stadium, and Hinds (19) have arrived from the Tigers until December 3 initially. Both have permission to feature for United in the Isuzu FA Trophy.
Hinds made his United debut as a 58th minute substitute at Peterborough Sports on Saturday – while Nixon was an unused sub.
Myles, meanwhile, has completed a move to National League North rivals Kettering. He made his Poppies debut against former club Brackley Town on Saturday and departs with eight appearances to his name as a Pilgrim.