Leonard Neumann used to offer a tongue muffler for the 5224 Enya that did not use a strap. Simple remedy was a muffler that had the bolts go through the edge of the muffler into the exhaust dimples. Yes you had to drill those 2 little dimples and thread them. I got 2 of them and sadly there were no more when I went back for them. I still use the 2 that I have and wonder why one of our providers wouldn't make one for you on an as needed basis.
I can post a picture if anyone needs to see what it looks like. A tongue muffler with 2 holes in it.
Dennis