Using a Firefox shortcut in Safari?

I am a long time firefox user, but I do use Safari often when on the family’s mac. I quite like it, however one little issue I have is losing the shortcut of Ctrl+Enter when entering a URL to finish it off with “www.” at the start and ”.com” at the end. Also using Shift for ”.net” and Ctrl+Shift for ”.org”.

My question is, is it possible at all to get these shortcuts or something similar over to Safari, via an app or something similar?

It’s quite a silly nonissue, but it bugs me…