Shower mixer handle sticking out too far aesthetically

An answer at this link suggested using a lavatory mounting ring

So I realize this thread has been going on for a couple years now, but I also ran into this problem. I didn't rush in buying the Moen extension plate. I instead went over to the local Home Depot and just started walking around looking for anything that I could mount on the front or back of the mounting plate and with a matching Satin Nickel finish.

In the faucet repair aisle I found a satin nickel lavatory mounting ring that worked quite nicely. Using some adhesive caulk, I glued the included rubber washer to the mounting ring and then the ring to the mounting plate.

The end result looks better than what I would have achieved with a correct install.

Possibly this link from homedepot for the lavatory mounting ring:

https://www.homedepot.com/p/Fontaine-Glass-Vessel-Bathroom-Sink-Mounting-Ring-in-Chrome-LNF-VSMR-CP/202996136

I don't have enough rep to comment yet so feel free to move into the other answer.