First off, since you’re likely only having these late night meetings “several times per week.” You’ll probably just have to make your schedule week to week. On days with late meetings, do your workout in the morning. The day following the late meeting, plan to do your workout after work so you can sleep in a bit - assuming you don’t have another meeting.
Not sure where you are in your career, but if you have some seniority, do your best to dictate days and times that you can have meetings.
I work “early” (in at 7:45/8am, which means I’m out the door around 7:15am) and more often than not I don’t head home until about 7pm, which gets me home around 7:45/8pm.
I manage to squeeze in lunch hour + workouts during the week with one or two early mornings during the week.
Sunday is my off day and I usually do next to nothing…except laundry.