If it's an ortho emulsion, a deep green filter can be used to darken blue skies, while brightening greens themselves. But exposures might be slower than usual because some ortho films are mostly blue sensitive, and only some green. I'm unfamiliar with the one in question.
Sounds like that might do the trick! It's Fujifilm HR-U (or HR-T? The labeling seems conflicted) Medium Green. Developed in Diafine, I've gotten good results rating it at 200 in daylight.
Slowing the exposure down a bit could be useful... the shutter on my only 8x10 lens just goes up to 1/50 which has made it tricky at times to use a wider aperture in daylight. I suppose I could use a different developer, but I've grown rather fond of Diafine and will stick with it for a bit longer I think.
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