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Upon thinking about this more carefully, the list of weapons post-Kiva that can fit in this line isn't too bad:

• There's the Kiva-la Saber
• Fourze's Billy the Rod (wait was that really the name?) and the Hee-Hackgun
• The Hamel Cane from Wizard
• 80-90% of the weapons from Gaim (aside from the previously mentioned Musou saber and DJ Gun)
• Build's side-form weapons like the Hawk Gatlinger and 4Koma Ninpoutou
• Woz's Zikan Despear (surpisingly)

Aside from that, shouldn't a bunch of the weapons from Showa be possible too?