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Maybe you should try it directly at Hohner.
I think to get a non original replacement part especially for Hohner would be difficult because these basses are not common enough.
But pickguards for Fender Precision basses are very easy to get. Doesn't they fit on a Hohner PJ? Maybe you have to drill new holes for the screws into the body but the old ones would be covered by the pickguard.
Last option is to let a company make a pickguard for you. There are several ones, but it's more expensive than a stock item.