The Dingle Way goes over the col (650 m) between Masatiompan and Piras Mor, and if conditions (and your equipment/experience) are suitable, Brandon's summit can be climbed as a round-trip within 2.5 to 3 hours. It's at 952m (3123 ft) and should be treated with respect, especially in mist or cloud when navigation becomes serious. It's described in some detail on page 51 of Sandra Bardwell's definitive guidebook
The Dingle Way, which is well worth reading.

Although you could descend a different way from Brandon (and some hapless walkers do so by mistake) that would make a significant departure from the Dingle Way.
By the way, panel 4 of the guidebook map shows the
Pilgrims' Route which follows a minor road south-west from Cloghane toward the loughs which feed the Cloghane River, below Ballysitteragh (623m). The col north of Ballysitteragh is at 397m, and from there it's only a couple of km to various roads that lead back to Dingle Town (about 8 km).
This looks like the basis of an even shorter version of the Dingle Way, admittedly missing Anascaul, but very feasible in 3 days: start and finish in Dingle, overnighting in Dunquin and Ballycurrane. This could be done in a long weekend and takes in many of the most scenic parts of the Way. I should stress that I haven't walked this, I've just been looking at the map and thinking I'd like to try it. Can anybody who has done it comment?