can the new 718 Ap2s accept KBS tour v shafts"

Yes all tip sizes for irons should be .355 Tip Diameter

Yes any taper shaft (.355) will fit. Only parallel (.370) will not fit without boring out the hosel a bit, and highly suggest against going this route.

Just about every company (I think every company but just incase) out makes a taper and also many parallel model counterparts as well.

Yes. Totally agree with Rob and Ryan. Reminder: get fitted, if you haven’t already. Enjoy your new irons.