Hoshino was producing their original Artist models from 1974, introducing a set-neck model in 1975. After the lawsuit, Hoshino Gakki abandoned the strategy of copying 'classic' electric guitar designs, having already introduced a plethora of original designs. Hoshino settled out of court in early 1978 and the case was officially closed on February 2, 1978. On a Jazz you can always turn both volumes up full to get some noise cancelling due to the phasing of the pickups but on a first generation single coil P-Bass you can not do that since there is only one pickup.

There is NOTHING like the sound of a first-generation P-Bass to me and I totally love that tone, but no other bass is more sensitive to RFI either. Foil shielding the back of the pickguard to ground only has a benefit when the pickguard actually surrounds a single coil pickup and on P/J's and most first generation single coil P-Basses the pickguard doesn't surround a single coil pickup. Shielding paint is better than nothing, but not as good as copper foil.

Even when Jazzes, P/J's and single-coil first-generation P-Bass instruments (Like the Squier Classic Vibe 50's P-Bass) have shielding paint factory applied in the cavities in my experience copper foil cavity shielding to ground makes an obvious improvement in RFI rejection and hum reduction. I'd skip shielding the P pickup cavity entirely.

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