Wheeler proposed this in 1955, albeit with EM or gravitational waves that were gravitationally bound.
I found out about it while, as a grad student avoiding thesis work, I took a stroll in a basement library at MIT. There's some WEIRD stuff in the literature!
JA Wheeler, "Geons", Phys Rev 97:2, 511–536. DOI: 10.1103/PhysRev.97.511.