Welcome, bro!
I know your pain well, my friend. From personal experience, I would opt for a Gillette Mach III or similar & make sure you use a soothing aftershave balm to help your scalp heal. Take it slow & easy & do not put too much pressure on the blade. I would also maybe use a pre-shave lotion before hand. When I did this it helped me immensely.
Best wishes.
