Combine different regional passes

Hello,
the JR Pass option seems to me the simplest and most convenient. However, with my itinerary, it might be more cost-effective to get regional passes. Would it be possible to buy two different regional passes on consecutive days? For example, the Osaka-Tokyo Hokuriku Arch for the first 7 days and the Kansai-Hiroshima for the following 5, and then return to Tokyo by purchasing an extra ticket?
Thank you!