We have no lower helm, so at least that's not a huge issue. Good to point it out, though; I can see (unintentional pun) where that would be a big deal.
The mesh windshield cover we had on the previous boat helped a lot, but it was a pain to look through (outwards). We usually only put it on in July and August, because of that.
Guys in another forum have been saying their tint jobs, ideally ceramic, many 3M, usually only windshield and sometimes slider... have cut down interior temps by at least 10°F or so... and that would help in our case.
Our current windshield is already tinted, but it has some flaws in the installation... and I expect it was just "stuff," probably not ceramic, and it doesn't really reduce interior heat all that much.
I'm thinking windshield and slider tinting, plus mesh cover in July and August, ideally to lower our saloon temps by a solid 10°F. Maybe revisit, potentially tinting side windows sometimes afterwards, depending on initial results.
-Chris