Probe was Command/ABC. Softs were touring with Hendrix around the time the first one came out. I assume they linked up with him either in London or in France. EMI released those albums overseas but only in tiny amounts, and they were mostly done for the US/Canada market, and in quick succession. Things changed by the time Third came around, when they were signed to CBS UK. I put the first two Softs in a similar bucket to the one holding Silver Apples.
FWIW, the Daevid Allen version of the band did have a single on Polydor (France?) but the full album was shelved. BYG put that material out when they had Gong in their stable.