Switching to a 28t inner is definitely a possibility. My current inner ring is a 74bcd ovaltech and I haven't found any 28t ovaltech rings. Was hoping to keep all the rings the same, for no reason other than look. Trying to have my cake and eat it too!
After reading thru this, it looks like those 5tooth jumps would be noticeable compared to the current 4tooth jumps, so your suggestion is probably best.