With how popular Gal Gohan seems to be, I think we'd all love to see an official English release! Seven Seas Entertainment is usually pretty good about picking up series that people want to see, and they also actually solicit feedback to that effect. So, without further ado, here's what you can do to maybe help get Gal Gohan released in English!
Step 1:
Visit Seven Seas Entertainment’s home page
Step 2:
Click on the survey link in the upper right as seen below
Step 3:
Fill it out as you like until you get to this portion:
Step 4:
Write in Gal Gohan and finish the survey as you like
Step 5:
You’re done!