I've seen a female sampire template solo semidar (in Ilshenar, no less, where the spawn can be paragons - multiple paragons from the 4th stage can be worse than any red raid), though they had to have help from a guildmember (possibly an alt of theirs running a second account on a different machine) to get through the burning gargoyles to the Daemons & succubi, who stayed nearby in case Semidar got lucky and killed the sampire.
I accidentally soloed barracoon in Ilshenar with my tamer/bard & GD (stumbled on the spawn running rats at 2 AM, no one showed - seemed like forever to get barracoon to drop; but that was probably because I am still training the character, didn't have disco on at the moment, and was limited to the occasional provo of a mage or archer paragon onto each other or onto Barracoon himself - at 90s music & provo, with a gwenno's harp - in fact, my only skills 100+ real skill were animal lore and Vet (magery & taming only over 100 through equipment; everything else 80s and 90s) - and I only used magery to heal the pet when it was fighting Barracoon, to stay out of range of the champ).
If you want Champ gold, the best way is to figure out a template that can solo Semidar, Neira or Mephitis in Ilshenar. People tend to avoid those spawns like the plague (in fact, the groups I've seen would rather fight RIKKTOR than one of those three, because of their stage 2-4 spawn types).
Anyone here besides me think they need to trade Bone Mages & Liches between stages for Neira, and Burning Gargoyles & Daemons between stages for Semidar?