Great!
Hoping for further suggestions shared. I am planning something similar as soon as I have time, but shorter (and off-road wherever possible). My main problem is the range in this very mountainous island, that could require a backup battery (4 kg more) and the need to recharge it too. I am putting together all the pieces and hope to start with a short 3 or 4 days trip in May.
Security side, I suggest you to buy a satellite localizer (I have a Spot Gen3, a bit old but very well done) that would allow you to ask for rescue even if the area is not covered by internet or phone network, and to send your position's updates automatically every set minutes to a few people that can easily find you in case of a problem. Overall costs is worth the effort, in my opinion. I never ever go out with my ebike (or for work, as I drive on a quite dangerous and exposed road) without it switched on.
A little OT: Just yesterday I met a guy on a bicycle loaded with stuff at my "place of work," an astronomical observatory at 2200 m of altitude. I chatted with him for a while and he told me that he has been traveling for a year and a half, covering all of Europe and now the Canary Islands, sleeping in sleeping bags wherever he happens to be,
which is the biggest limitation, in my opinion of ebikes as they need to be recharged overnight.
I have met many people like him in my life, independent traveler eagers just to go as a free soul. Both here or in the most isolated locations in Chile and other countries, no ties, no youtube video or blog behind them. A former colleague of mine in Cardiff went with a pretty old and rundown bicycle from UK all the way to Sydney, returning later from South America up to Florida, where unfortunately he got involved in an accident (and broke his arm).
Why I tell you about it??? Because I die of envy when I talk to these people, damn them!!!