An extendable pole and a plug knocker are both valuable fishing tools that you need to have in your boat. Neither one of them works particularly well from the bank. I'd guess that the extendable lure retriever might work a little better, but bank fishing, that's just one more thing to carry.
That being said, 4 lost lures in 3 hours fishing time isn't a record. You are going to have to try harder than that if you want to set a lure losing record.
If you need any pointers on how to set a lure losing record, here are a few: Use older, more brittle mono. Insist on the lightest line possible. Fish in brushy, hard to get to places and maybe you can lose a few lures on the backswing of your cast. If you are fishing from the bank around brush and cover, using lighter lines and lures, always try to throw into the wind.
These tips should help you increase your lost lures per hour ratio. There are lots more ways to lose lures, but I'm pretty sure you can figure them out by yourself. Don't forget the old "unlatch the tackle box" trick.
This will allow you to lose many lures without actually getting them wet.