Bachmann made the BQ23-7 in HO in the Family Lines scheme. It was during the era of fairly poor drive mechanisms, but a pretty cool engine as it was one of the first "crew cabs" in the US.
Yes it is "homely", but the uglier the better when it comes to this hobby!
Sadly, it is difficult in this era of O scale to bring a model like this to the marketplace. It is in that odd era where there are not as many modelers doing the 80's, it is specific to one road, and unlike HO, there aren't over 1000 people that would buy this model.
Contrary to some opinions, the business has no bias against southern roads. The business is all based on what will sell and what won't. Southern, ACL and SCL tend to do well.
Nothing to say that a company like 3rd Rail wouldn't consider it with enough interest. It would simply be a $1200 locomotive to offset the tooling cost for a niche product. It would be like the Krauss Maffei. 200 tops if it could even sell that many.