Using 2 seperate passes for Gero Station to Hiroshima Station

Hello, I would be travelling from Gero Station, down to Hiroshima Station while concurrently holding 2 regional pass,
Alpine-Takayama-Matsumoto Area Tourist Pass & Kansai-Hiroshima Pass. However, there is a portion of the journey which isn't covered by the pass. (Nagoya to Shin-Osaka).

I would like to ask if I can just purchase the portion of the Nozomi Shinkansen ticket from Nagoya to Shin-Osaka, and complete the Shin-Osaka to Hiroshima Portion using the pass, without alighting at Shin-Osaka?