I start my own build of pidgin with a batch file.
start ./Pidgin/pidgin.exe -c Data /nosplash /minimized
Frist feature is to write PIDGIN_MULTI_INST to windows variables. This could be done to start the launcher with an option -PIDGIN_MULTI_INST=2.
Second feature to be able to add /nosplash and /minimized to the launcher so no splash screen will pop up and pidgin will be started into tray and not fullscreen.