I think the cardio is probably far more important for you. My Pops had a heart attack at age 47. He started doing cardio afterward, but little to no weights. Around age 60 he added very light (3, 5, and 10 pounds) dumbbells to his exercise, and he always does stretches. He turns 85 next month and is still standing straight with full mobility, and still walks 4-5 times a week.
If you haven't already, I'd talk to the doc about weight training so soon after a stroke. I'm not an expert though, and you know your own body better than anyone else, including the doc. You sound like you're on the right track to me...