I MAY have found the aux power plug under the left side upper front fairing. There is a thick cable running to the lights and it has an unused end with cap on it.
With a right Honda connector plug, one should be able to easily plug in to 12V aux power. I tested the plug and it is dead when power is turned off, but gives out 12 volts once the ignition is turned on. Next job is to confirm that this plug can actually safely be used and find out where I can score the proper female plug that fits.
DO NOT MAKE ANY INSTALLATIONS, MODS ETC. BASED ON THE INFORMATION ABOVE.
I have succesfully used the above plug as a switched power source to charge my phone & GPS.
There is also another source for switched power under the seat. Read more -> https://honda250rally.com/2017/05/10/aux-power-source-ii/
***THE SOCKET UNDER THE SEAT CAN NOT BE USED FOR POWER**
It is a diagnostics plug.
UPDATE II [Jan. 22nd.]
The connector plug seems to very hard to come by. Leave your hot tips on the comments if you have any. The connector one needs is a HX60. More info -> http://prd.sws.co.jp/components/en/detail.php?number_s=61897408