I couldn't get a PE for a quick look at a skylight I boxed for less than $500 in Los Angeles 20 years ago. Then, once he saw it was OK, he wanted $500 more to stamp MY drawing.
maybe look harder? I had to cut a truss to add a ceiling fan. Permit required a PE's stamp for the truss cut change. $200 and two days later I had a drawing. Guy even came to the house to look at it in person. The places to ask are the contractors who do the work. Lots of times they will know someone who takes small, quick and easy jobs. The issue for the OP is that the city may want a permit to enclose a wall. They will check electrical, insulation, venting and even drywall screw placement, taping etc.. I recently redid a bathroom and the city wanted to check that the screws were X inches apart. Fortunately they knew the drywall contractor well, and I also know drywall, so they let me be the inspector on that part of the job and waived it. My next door neighbor who also did a bathroom at the same time, the city went over every step with them two or three times because they tried to do it themselves, without really knowing how so it took months and many visits before they got signed off.
I didn’t miss that.
I didn't miss that and pointed it out in another forum a day or two before he posted exact same post and pictures here.
How would you (or anyone else reading this!) suggest beefing up the situation?
the span between the red marks is to long, so add 2 - 2x4’s supports up to the 2x8 (blue marks) basically your just shortening the span with a 2nd support up to the ridge 2x8.
If that span between the red marks is 14 ft and you add 2 supports up to the 2x8. split the span equally you would have 3 sections of 4ft 8inch that’s way over kill to support drywall and insulation
measure in 4-5ft from the 2x8 / 2x4 intersection @ each end and add another 2x4 up to the 2x8, it’s probably going to be 24 to 34 inch long then use a structural screw like a 3inch T25 & screw 2 screws at each mounting location. Or a 16penny nail out of nail gun.