I'm not sure about the Panasonic camera, but with the Nikon D7500, you don't need a remote that holds the shutter for a long time. You can do single-press shutter button exposure bracketing by setting the bracket function and setting the interval timer function.
First, as you're probably doing, set the number and EV range of your brackets by pressing the BKT button.
Secondly, set the interval timer to start
Now, taking 1 interval of as many shots as you set in the Bracketing function. You can also set a short delay between shots (I usually keep that delay to a minimum). By doing this, with a single press of the shutter button (or the remote's button), you will take, say, 3 bracketed shots automatically. The next time you press the shutter button, you will take 3 more bracketed shots.
When you're done with bracketed shooting, you have to remember to turn off both bracketing and the interval timer. I know, it's a bit fidgety, and easy to forget to set (or disable) both modes. But it's how it's done with Nikon DSLRs.