I recommend an inversion table. You can buy this for as low as $100. It flips you upside down for all the benefits of a headstand. But there is no stress on your head or hands. I got one because I couldn't do a headstand and use it a couple times a day.
The headstand variation with block stack is absolutely brilliant, both in preparation and in the actual headstand. I never would have imagined what a difference opening and supporting the upper back would make. Thank you.
minimum of ten minutes in a headstead, it's not the poison that is toxic it's the dosage