Almost definitely, theres not much that can stop a large plec doing what it wants.
Iv never known a large plec to be a good scavenger you would almost definitely have more luck using some of your larger clowns. More to the fact L114, L25 are very much protein based and would find a food source of scraps insufficient.
A large plec probably wouldn't scavenge for such minute particles of food and even if it did would simply make more of the matter smaller then consumed, leading to a faster break down anyway. Large silver dollars even though not a bottom dweller will remain too large for your fish to eat, remain sub-dominant in the feeding chain and swiftly consume any food the Saratoga leaves to fall.
HTH