I'm not sure a clean up crew is the right solution. Perhaps down the line when you are able to be on top of water changes again, but whilst they might eat the food, they'll still turn it into waste. So I agree, as you are already doing, feeding less is the best option.
To clean it up, you can syphon, you don't have to do a full water change, just enough to get out the waste. You can just use airline if you want, although you might need to go a little wider tube depending on the waste/gravel. You need a piece long enough to reach the bottom of your tank, go up out and then hang down to a bucket below. Submerge the whole airline until it's filled with water, put you thumb over one end and lift that end out and put in the bucket (making sure the other end stays under). That will start a syphon, hold the end it the tank over the mess and it will suck it up along with the water.
Ideally you'd then top up the tank with fresh water, but if you are physically unable to do that you can wait for your bucket to settle and take the water off the top.