I heard from Tomio at SHOEI lately that the MP 40 modelgun (dummy version, no "blowback" plug fire cap version) will be their next project. They are behind schedule for sure, but the situation over the last years (Covid-19 and energy crisis, as well as the war in Ukraine) made everything much more expensive and complicated.
Right now Shoei is working desperately to finish and deliver the FG 42 Type 2 models, even working on weekends, so if you contact Tomio please understand that he may take a little longer to answer or if his mails are shorter or even less polite than they used to be.