For what it's worth, I have a Gnome Warrior who follows Rallos Zek. The West Freeport Guards are Apprehensive, and the North Freeport Guards are indifferent. I don't think Gnome by itself has enough of a modifier to say that will be different for Barbarians. So you should be fine in Freeport and Qeynos at least.
As JimJam points out, Kaladim (Brell) may be an issue. Unless you want to do the crushbone belts quest, there isn't much reason to go to Kaladim anyway. It's not a long journey to get to Greater Faydark if you need to find merchants and a bank.
I am not sure about Erudite factions, if you wanted to try going to the Warrens to level.
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