As you may know, second bivalent boosters are currently only approved for people 65+ or whom are immune compromised. As you also may know, the vast majority of the booster's effect only lasts about three months.
I scheduled it online- I just ticked yes for the first box for "are you taking any meds that may compromise your immune system." The same question is repeated a second time on another page but answering yes here requires you to enter information about the medication, so I entered no and it let me schedule it anyway.
If I was asked in person I was just going to say I use a steroid nasal spray (i don't) but the dude didn't say anything. Seemed happy to have someone getting a vax if anything.
as an immunocompromised diabetic - i recommend just saying you're diabetic they can't really verify that other than asking to check your blood glucose level and tbh even then they're not gonna be like "wow are you sure about that???"