Is it possible to only show the Unity Splash screen in certain situations?

Hello

Our team is working on an educational title that will be used in a class room setting. For the convenience of the teacher we have two ways to enter the game :

1. Start the .exe, here we want to show the unity splash, our own splash and navigate to a theme selection, we call this the long path and it will be used for free exploration moments throughout the year.

2. Click a link in a browser, our application starts and the correct game immediately loads, this is the short path and will be used as part of a lesson.

We have a pro license and in order to make path 2 work we supress the Unity Splash screen, so the short path works. We have a credit where credit is due mentality though so we'd really like to show a Unity Splash when taking the long path.

So :

1. Is there a way to change if the Unity Splash should be shown at runtime?

2. If not, are we allowed to create our own Unity Splash and show that to the user?