A minor discovery? Did ya know ....
If you set the rocker switch for the Hi/Low beam, halfway between Hi and Low, you get both hi/low lights burning at the same time.
The switch has a notch to hold it, and the high beam indicator dims by about half.
Next time I'm dodging crap in the night, I'm trying this. Looked good on the garage wall.
Maybe I'll test it in the daytime and have a spare fuse handy. Charging system seemed to be handling it at idle.
I've done this on some cars. Some handle it, others just shut off the lights.