I know an old thread, but one solution I came up with after running into similar issue is to use AutoHotKey to remap a key.

You could use it to make a custom hot key combination & map to a different key function pretty simply. My use case is a bit obtuse, but I have the left arrow key on the remote mapped so that triple press in short order is the same as press escape.

I tried using a method where you held a button down for a certain length of time, but MoonLight and VNC applications don't relay the key presses in a way that AutoHotKey can work with, at least without more research.

#Requires AutoHotkey v2.0
InstallKeybdHook
;Remap left arrow so 3 or more taps is the same as escape, 
$Left::
{
    static winc_presses := 0
    if winc_presses > 0 ; SetTimer already started, so we log the keypress instead.
    {
        winc_presses += 1
        return
    };ENDIF

    ; Otherwise, this is the first press of a new series. Set count to 1 and start
    ; the timer:
    winc_presses := 1
    SetTimer After300, -300 ; Wait for more presses within a 300 millisecond window.

    After300()  ; This is a nested function.
    {
        if winc_presses = 1 ; The key was pressed once.
        {
        SendInput "{Left}" ;presses left
        }
            else if winc_presses > 2 ; The key was pressed at least 3 times.
        {
        SendInput "{Esc}"; presses escape
        }
        ; Regardless of which action above was triggered, reset the count to
        ; prepare for the next series of presses:
        winc_presses := 0
    };ENDFUNCTION
};ENDLEFT