Not sure I'd be a fan of it.
spoilers:end of spoilers
At the end of the day it's a Superman show, so I wouldn't want him to be overshadowed by Diggle. But also at the same time I want Ramsey to have the chance to play Green Lantern, as GL should be be portrayed, which is an alien cop traversing the universe taking on alien threats. We wouldn't get that here since it's going to be focused on Superman and his family. Not to mention I'm not sure the budget could even handle having GL, look at Supergirl with MM they can't even CGI him anymore. I'd prefer he be in the HBO Lantern show, where he'd get a good budget, and focus as a main character. They could take him to S&L, though I don't think it'd do good in the long run for the character.