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When i did the raid Pyrenean and then the Alps via Ventoux unsupported in 2014 I used revelate luggage. For front lights I used a fork mounted LED flasher so cars could see me and a helmet mounted light so I could see. I mounted my garmin so that it was behind the bars and offset enough to allow turning without hitting my top tube bag. this also meant it was easy to run a power lead from my compact power supply to the garmin at the end of long stages when the battery was dropping off.
Ah, you went across. That's another option on the road bike but not so much on the TT bike.