I had enough roof vents, the problem was that under the soffits was plywood, so zero intake air. So I pulled that down, and saw that between the roof and wall, it was stuffed with blown in insulation. So I pushed it back the best I could, then cut 6' long boards the width of the opening and inserted them from inside the attic, sliding them down, then fastened them down to create a ~2" air gap. I fastened the boards in the attic to maintain the gap. Repeat about 40 times.
One major issues is that the ceiling joists also run into that space, at odd spacing, so I had to cut gaps for them, most being unique. So I had to have a key of what board went where. Generally, it was all a miserable experience I'd like to never repeat, but I couldn't figure out another way to tackle it. Anything inserted from outside wouldn't get past the joists, and they needed to be long enough to clear the depth of the insulation. But just being in the attic feels way better now, so I think I've resolved it.