So I set about to see if there is a generic "skilled" class in PnP without all the frills, and lo and behold, their was the Expert (Unearthed Arcana, 3.5E).
Expert
Hit Die: d6
BAB: ¾
Saves: Two good saves and one poor save
Bonus Feats: 1st, 2nd, 4th, 8th, 12th, 16th, 20th
Skill Points: 6+Int modifier (x4 at 1st level)
Skills: All Craft and Profession plus any other twelve skills
Expert Variants (made myself, adjust as desired)
Aristocrat
Saves: Fort, Will
Skills: Appraise, Bluff, Craft (all), Diplomacy, Listen, Lore (Geography), Lore (History), Lore (Local), Lore (Nobility), Perform, Sense motive, Spot, Survival
Sage
Saves: Fort, Will
Skills: Appraise, Craft (all), Lore (all), Spellcraft
Trader
Saves: Fort, Will
Skills: Appraise, Bluff, Craft (all), Diplomacy, Listen, Lore (Arcana), Lore (Dungeoneering), Lore (Engineering), Lore (Geography), Lore (Local), Sense motive, Spot, Survival
I chose Fort/Will for the good saves because generally those are the more desirable saves, so given the choice most players would choose them. Also then the player just needs to worry about which skills they're looking for.
If there is no hard cap to number of classes I guess this would be pretty easy to add in, since they have no special abilities? .