The covers band I play uses a few different tunings so for rehearsing and gigging I use one of these for one or two semitones down. Dead easy and you can keep everything at std set up and tuning:
https://www.andertons.co.uk/guitar-dept/guitar-pedals/pitch-shifter-pedals/digitech-drop-pedal
Purists will of course hate it, and tbf I would never record with it, but it's fine for messing around with. Everything from Greenday to slower stuff.