Making the spray pocket deeper or open ended to allow the handle to go in tighter. May protect the handle a bit more and prevent Discharge or being caught on bush etc.
The bear attack experts here, (read as the guys who investigate every attack here and get invited to assist in other jurisdictions) want the spray accessible and typically on your chest, slanted toward the dominant hand.
As has been noted already, practice, practice, … if you can’t draw and deploy quickly, you’re done.
The experts also suggest that you actually have it with you to be useful. If this rig gets you carrying it all the time, then it is good.
My friend who survived a Grizzly attack/mauling, had bear spray with him and a rifle. Both attached to his pack. They both stayed safely stowed on his pack while he was mauled.
In bear country, have the rig on you at all times, ready to go. You will not sit down for lunch with the rifle across your lap! If that rig keeps the tools on your body, you‘re far ahead of the unprepared.
Good luck with 2.0
Dragging a pee shooter along up here is illegal, so we have two options. Spray and your rifle. Spray is easier when surprised at close range. Try and carry a rifle in the ready carry position all day. Not happening.
Wounded bears, you are better off learning to shoot straight. It’s safer.
Spray is not for wounded bears.