Are you looking for a 7 speed shifter for a drop-bar road bike, similar to RSX?

That might not be simple, as I think RSX were the only common 7-speed brifters.

You could use 7-speed bar-end shifters with "brake only" brake levers. Other options might include brake levers with external shifters or uncommon parts such as Suntour Command shifters.

In contrast, flat-bar bikes have oodles of 7-speed shifter options.