Wouldn'tthe easiest solution be for us all to be less lazy and just say "Text Messaged"? "Texted" sounds unintelligent anyway. I can't bring myself to say it.....at all. If you are in that much of a hurry..... like, "Someones gonna die if I say more words than necessary", then "I" think the "fastest past tense" should be simply "Text", as in, "I text her earlier, but got no response." There are plenty of words in the English language which share the rule that present, and past tense, are the same spelling:

hit and hit
hurt and hurt
Let and let
Quit and Quit
Set and Set
Shut and Shut
Spread and Spread
Cut and Cut
Wet and Wet

Thanks for your consideration : )