Sadly I think you're out of luck, Rev...at least for a new or currently manufactured knife.
My observations:
Queen does not show a barlow in their 2004 catalog....the standard offerings were delrin anyway, now apparently discontinued for 2004.
Camillus may still make a barlow, but would be delrin handles
Henckels has offered barlows in recent years, but they are made by Boker anyway, don't know if they have the same quality issues.
Before Colonila went out of business, they had a division called Heritage....they made small runs of high quality slipjoints with natural handle materials...including barlows...I have heard that this division emerged from the bankruptcy....might be worth looking into.
Your only other shots might be to look for a Schrade Heritage series bone handle barlow, made in 1983, 84, maybe up to 86.....you see them on ebay...
I share your yearning for a good basic barlow...2 blades, sawcut bone, carbon steel....its interesting that nobody seems to make them anymore...