It really isn't necessary ta make a launcher specifically for Inferno. If you were to set up a directory with its own launcher, exe, and the inferno VPs, without any -mod switch, Inferno is what would load.
But it isn't that hard to make a desktop shortcut that would just launch straight into inferno, either.
Say you're using 3.6.7 release. The shortcut would need to look something like this:
C:\Games\Freespace2\fs2_open_367.exe -mod Inferno -your -other -options -here
Working directory: C:\Games\Freespace2
By putting the parameters you commonly use where I put "-your -other -options -here," you should get it to run from a shortcut.