No, it is not possible. To get inside the lens, you have to disassemble nearly everything.
You can do it, I have disassembled my HX400V for another issue, but also cleaned the lenses with success.
You can may have a look into my Teardown of the HX400V, which has very similar optical parts.
[guide|110076]
Also this video is maybe helpful for disassemble: https://www.youtube.com/watch?v=Ru55zJWHCc0