Here's the (very) rough take I posted over at the marvel masterworks board of what a possible mapping for the three main titles could look like:
CONAN THE BARBARIAN
VOLUME 1-CTB 1-26, ST 1 & 4, CC 1-11
V2-CTB 27-51, ST 2-5, SSOC 1 and material from MTE 4 and Red Nails special
V3-CTB 52-83, MF 6-7, MTE 15
V4-CTB 84-115
V5-CTB 116-140 & Annual 6
V6-CTB 141-165 & Annuals 8 & 9
V7-CTB 166-190 & Annual 10 & 11
V8-CTB 191-215 and Annual 12
V9-CTB 216-240
V10-CTB 241-263 and SSOC 2 (Black Colossus in color)
V11-CTB 264-275, SSOC 218-221, 223-224, 226, 229-235 and GN Ravagers at the End of Time
KING CONAN
OMNIBUS V1-KC 1-8, CTB Annual 2, 4 & 5, GSC 1-4 and material from SSOC 8, 10 & 30
V2-KC 9-19, CTK 20-26
V3-CTK 27-40
V4-CTK 41-55 and GN Conan of the Isles.
I never finished the SSOC mapping, I had some giant volumes trying to encompass all the Kull Solomon Kane and Red Sonja material. These should probably end up running close to 800-900 pages. Here's the first few (I have articles included, if they leave them out, it might save at least one volume):
OMNIBUS V1-ST 1-5, SSOC 1-10, Kull & the Barbarians 1-3 and material from Monsters Unleashed #1
V2-SSOC 11-21
V3-SSOC 22-30, MSS #2 plus I threw in B&W versions of Phoenix on the Sword and Red Shadows
V4-SSOC 31-39, MSS 9 plus a B&W version of Thing from the Crypt
V5-SSOC 40-52, I also threw in Marvel Preview #19 (Kull)
V6-SSOC 53-64, Marvel Preview 26 (Kull) and Epic Illustrated 2-5 (Almuric)
V7-SSOC 65-79, plus Men of the Shadows collected together to wrap up Roy's involvement
V8-SSOC 80-95
V9-SSOC 96-110
V10-SSOC 111-125