The F-100 didn't have a long range radar, since it had the open intake, so Im pretty sure it could not have carried a Sparrow. I think any mods of it would most likely involve cluster munitions and later versoins of bombs. I don't know if they could find the room internally to mount the Maverick equipment, and I dunno if they would use an external pod for the reasons cited. But that doesn't mean they could not.
By the time the Maverick became prominent, the F-100s had been regulated mostly to reserves and ANG (I remember around 1970 the Ga. ANG replacing its C-124s with F-100s in Nam camo).
I know the ROC and Turkey used the F-100 into the 70s and were probably the longest users of it. I'd check any sites on the Taiwan and Turkish AFs to see if they made any significant mods.
The Chinese F-6 was modernized a great deal, with an American ejection seat, could carry AIM-9Js, and some other improvements I cant remember. Pakistan may have made mods also. You may want to research that as well.