Absolutely, using a shallower angle and limiting the inverted time to 30 sec with a 10 to 20 sec break, then repeating this over about 10 min would still give you a lot of benefit to your back while minimizing the strain on your cardiovascular system. As your cardiovascular system becomes accustomed to the inversion you can slowly increase the inverted interval or increase the inversion angle.

People who have been bed ridden for a length of time have to go through a similar process to get upright again just because their cardiovascular systems are not used to being upright. It takes some relearning by that part of your nervous system that controls blood pressure and blow flow.

Hope that helps.