I'm actually glad you posted about this, I was getting ready to ask how people use ovaltine in their formulas since I had recently went out and picked up some for milkshakes.
Well, it's not exactly your formula... but here's what I am going to try:
Lactic Acid 0.70%
Ovaltine Classic 2.50%
I have KASL on hand so I am going to use that. I also, as standard procedure, add lactic acid to get that sourdough flavor with none of the sourdough hassle.
I am making it tonight, but I'll let it retard until maybe Tuesday unless I have a chance to bake earlier. I'll report back.