I found several possibilities through the Steve Morse website. (You can try it here: http://stevemorse.org/ellis2/ellisgold.html
but the birth years don't match exactly. It would be good to know how accurate that birth year is -- i.e., its source.
Two more suggestions:
Contact the cemetery to see who bought the lot and when.
Take a look at this book "Pioneer history of Bandera county" (Felix is not in it, but other Haiduks are...relatives?)http://catalog.hathitrust.org/Record/011210165
Sounds as if you have your work cut out for you! Good luck in your research!