Could fishing vessels relay warnings to Kido Butai?

Could civilian fishing vessels form a radio relay to warn Kido Butai?

Not plausibly without attracting attention; enough radio-equipped fishing vessels in a line across the open ocean would look highly suspicious.

The proposal tries to solve Japan's radio-silence problem with civilian vessels acting as low-power relays. Suitable two-way radios were not universal even on large merchant ships decades later, making a chain of equipped fishing vessels in 1941 conspicuous. One such vessel might pass as an exception, but a sequence positioned across the ocean would invite investigation. The relay network would therefore trade communications reach for a serious operational-security risk.