Sorry to read about your problems.
Unfortunately, steroids affect us all differently and different steroids affect the same person differently so you will probably have to play it by ear with extra testing and correcting.
I had steroids injected into my hand a few years ago, found they increased by BG and I needed to increase my basal by 50% for about 2 weeks.
But you will probably have different steroids at a different strength so I would not take this as indicative of what will happen with your BG.