
20-year-old Hereford born Morris joined the North Wales outfit on loan at the end of January and has gone on to put in several solid performances.
He grabbed his goals late on in the game and within a minute of each other as the Gulls struggled to cope with the Wrexham attack.
Former Stoke City youth Louis Moult bagged the other goal as they booked their place at the final for the second season running.
They will be joined at Wembley by North Ferriby United, who beat Bath City 4-2 on penalties as their two-legged affair ended 3-3 on aggregate.
Kieron is joined at Wrexham with a host of former Saddlers as Dean Keates, Andy Bishop and Manny Smith are all part of the Welsh side's squad.