the Remote can do this easily 
I'm sure you've already thought of this, but without the the Remote, easiest way is to select another rig with those fx turned on.
the Remote can do this easily
Exactly why I have a remote
But, if you are using the Remote, and you assign:
FX switch 1 to delay
FX switch 2 to OD (slot A)
FX switch 3 to boost ( slot B)
You could assign slot C and slot D to switch 4, but, there is one Delay slot, so it could not be assigned to both switch 1 And switch 4.
A MIDI controller that can send three CC numbers per switch could be used to do this.
Changing to another rig is likely the simplest solution.
Set up Performance Mode for "auto load, same slot" when you change banks.
You could add two Performance Banks- one above and one below your two current banks:
Solo Bank 2
Current Bank 2
Current Bank 1
Solo bank 1
Or, if you want to always move up for a solo:
solo bank 2
current bank 2
solo bank 1
current bank 1
You could assign slot C and slot D to switch 4, but, there is one Delay slot, so it could not be assigned to both switch 1 And switch 4.
Exactly, you can't assign the same slot to 2 different buttons on the Remote.
