Can’t find the sauce, but MIT published a concept study about putting giant Mylar balloons at the L1 LaGrange point to reflect solar radiation as an alternative to aerosols.
A slight tangent, but there was an interesting experiment by Russia in the 1990s that involved solar reflectors on satellites to shine more light on the Earth. See Znamya (satellite): https://en.wikipedia.org/wiki/Znamya_(satellite)