I don't know what effect 3 lbs of flaked barley may have, perhaps a hard time sparging?, but is there a store selling bulk foods nearby? If so, they may have flaked barley; there is a farmers market here that has flaked barley. And, you could use quick oats (oatmeal) from a grocery store instead of flaked oats. The quick oats just need to be added to boiling water and cooked for a minute, then into the mash.
I used to be dyslexic, but am KO now!!
Enola Gay--Far East Tour Summer '45--Coming to Your Town, Limited Engagement--Get Your Seats Now!!--They'll Be Gone in a Flash!!