You won’t find much on the web about Waco Wonder. The short summary is that it is 40 nuts per pound with 56% kernel, somewhat scab susceptible rating about 2 on Wes Rice’s scale. The tree is a moderate producer but likely protogynous from what little information I’ve found. Wes Rice suggested I find out about it a few months ago. I have arranged to get scionwood in a few weeks.
As for self-fruitful pecans, I suggest doing some due diligence. Self pollinated pecans tend to have a lot of problems including shuck decline, heavy fruit drop, and poorly filled nuts. Whether it is self-fruitful or not, production will be better with a compatible pollinator. Instead of forcing the plant to meet your ideals, maybe look at making your ideals fit the plant. A few varieties that overlap pollen shed with pistillate receptivity are: Western, Syrup Mill, Cherokee, Jubilee, Baby B, and Barton. Most of these would not be suitable for your climate due to chilling requirements. There are a few others shown in the pecan pollination chart.
There are self perpetuating stands of native pecan about half way to Mexico City. Pecans are widely cultivated where water and suitable land are available. I do not know of any selections made from the southernmost populations though I’m fairly sure L.J. Grauke would have some information.
Ukulinga is difficult to find information about. It was selected for high disease resistance under conditions prevalent in South Africa. There is just barely enough information to conclude that it would not be viable here in the U.S. The short version is that South Africa does not have scab like we have and we do not have 250 day growing seasons like they have.
Western Schley aka “Western” is a 100 year old selection from San Saba Texas by E.E. Risien. It was mentioned a few days ago when someone in a northern state noted it would be a good pollinator for his trees from Stark.