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No doubt it's been answered elsewhere
Many times. Many, many times.
The invisible hack is the biro-spring method, but ain't nobody got time fo dat, so a simple wrap of self amalgamating tape round the lever and hood does the job and is pretty unobtrusive if you have black levers and black tape. You can also get the tape in clear which would probably look better with silver levers. You can see it (just) on the left lever on my 464 in the relevant thread.
No doubt it's been answered elsewhere so I apologise;
What's the go-to solution to avoid rattle from an unsprung brake lever sans cable?
(I'm running a pair of SRAM S500's without rear brake and don't want to wrap bars without knowing I have a robust, lasting solution!)