If you had a frontal lobotomy, they could also probably surgically flatten your forehead. That might be the cheapest way to go, since you could use all those new helmets sitting around your house then. Plus you probably wouldn't even notice that the helmet didn't fit.
I also have your problem shaped head and never really found a perfect fit helmet, but do OK with a Shoei RFR, which they unfortunately don't make anymore. The newer Shoei's don't fit as well but I bought 2 at the time so one is in the closet waiting to go.
Suggest you do what I did, which is go to every shop in town to try on helmets and when you find an acceptable (not perfect one), buy 2 or 3. One good thing is that they tend to conform at least a little to your head after a year or so of use, so if you find anything acceptable, it will get better with time.
Note: I still have a red spot on my forehead after riding all day that lasts for several hours. Just life.
I also have your problem shaped head and never really found a perfect fit helmet, but do OK with a Shoei RFR, which they unfortunately don't make anymore. The newer Shoei's don't fit as well but I bought 2 at the time so one is in the closet waiting to go.
Suggest you do what I did, which is go to every shop in town to try on helmets and when you find an acceptable (not perfect one), buy 2 or 3. One good thing is that they tend to conform at least a little to your head after a year or so of use, so if you find anything acceptable, it will get better with time.
Note: I still have a red spot on my forehead after riding all day that lasts for several hours. Just life.