What a delightful view! You don't show how high your ceiling is or what configuration it follows above your window wall, but if it is not vaulted you might consider ceiling-mounted tracks that will allow drapes to be opened and closed across the full sweep of the windows. Ceiling-mounted curtain suspension systems are easiest to find for stages, studios, and hospitals, but this type of suspension system is also manufactured for home use. The downside is that you lose the decorative element that wall-mounted rods and supports can provide. See http://www.curtain-tracks.com/hardware/ceiling-mounted/ or http://draperytracksystems.com/news/ Here is a link that might be useful: Fitting A Ceiling Mounted Curtain Track

@Kristy Bible, if you're still around, do you mind sharing how your Andersen Woodwright windows have held up? We are window shopping and this is a contender though I wish factory stain was an option. I am not a huge fan of the "stone" or "white" sash lock either, though the "gray" balance channel (maybe called Jamb Liner) appears to "match" the "stone" sash lock fairly well. The other option for the balance channel is "white," I believe.

Thank you--good point. I hope so. They are much chunkier than I thought they would be and not exactly white (more of a light concrete color)--and the side latches have plastic pulls--so I hope they don't look strange near vintage-style brass cabinet hardware.

A room darkening rod might work. This one (according to reviews) projects out only 3" https://www.amazon.com/AmazonBasics-Room-Darkening-Curtain-Rod-Nickel/dp/B0792MXSQT/ref=pd_mrai_hpb_ps_hpb_4/132-1269236-6117405?_encoding=UTF8&pd_rd_i=B0792MXSQT&pd_rd_r=4e7172de-7b35-4652-a4b6-6d99256e37b0&pd_rd_w=ZqluK&pd_rd_wg=zjTD0&pf_rd_p=71348d8b-bf19-41d7-acc1-9ec9ff8315c8&pf_rd_r=SAHSP40ME65F1FN2D2CQ&psc=1&refRID=SAHSP40ME65F1FN2D2CQ