I've always liked the look of the H 75. Sometimes I wonder how close it could have been to an early Fw 190 with just a few improvements. It obviously needed a few more horsepower, and finding a radial with the required power at a reasonable weight may have been a problem. The Gnome-Rhone 14R-4 as fitted in the MB 157 may have been a possibility, with the R 1830 often being used to replace the Gnome-Rhone 14N.
There are reports from pilots who flew both the Hawk and the Hurricane that they preferred the Hawk, while some claimed it to have better flying qualities than the early Spitfires above 300 mph, except at high altitudes.
As history actually happened, we saw this develop into the P 40, which led indirectly to the Mustang, while USAAF radials culminated in the Thunderbolt. A more successful Hawk may have seen these delayed, and while extra numbers may have been available for the Battle of Britain, I understand that there were more than enough Spitfires and Hurricanes for the number of trained pilots anyway.