Gonna have to monkey climb on the roof and probably straddle the main pitch to reach that lamp. I guarantee that's how it got installed in the first place lol.

Wouldn't even need to be a solar node. There's a 120v circuit to the lamp if you wanted.

Probably possible to fly it up there with a drone and attach it somehow.

Or put some wooden planks on the roof to increase the weight distribution when someone climbs up.

Do you have a potato cannon? They are used to launch ropes into trees when you can't throw it that high. Then just pulley the node up and attach the rope somewhere more convenient. Attach some smaller lines to the node to orient it.

I'm having trouble with the scale - could you do a scaffold with two ladders and some planks, maybe across a corner?