I found a thread in Japanese anonymous BBS that an R owner had his dealer mechanic retrofit a switch for hazard flasher. He said that It was working fine, but there was a limit. When the hazard switch is activated with turn signal is on, the left and right indicators blink alternatively.
I noticed that the 4-way hazard flasher can be achievable by retrofitting an additional switch. However, since BBS is anonymous, there is no way to send PM to him or prove it is true.
If I had gain access to the wiring diagram, I will be able to do that modification by myself with confidence, but I have not enough passion to tweak the actual harness right now...
1994 F650 Funduro (sold)
2000 F650GS (going to say goodbye)
2017 G310GS (new)