They seem to be a reliable enough. But that is a long distance. I would be a little nervous about it, but the bike is my daily commuter to work so I probably rely on it more than you would need to. I say go for it.
I absolute, entirely, and irrevocably disagree. Any bike can ride on gravel, including a Grom or a scooter. The bike has very little to do with it, whereas the rider's skills, confidence and experience are everything. I ride my MTS V4 on gravel, mud, rocks, ruts, and in water - and even though I don't consider myself very skilled, I never dropped it once. Dropping a bike on gravel would suggest either an utter beginner, or someone who is riding outside their skill envelope. I rode my Ducati XDiavel on gravel roads with no incident, and then rode my BMW F750GS on the same roads and broke both wheel rims because I was over-confident.Having owned 2 Multistrada's and 3 1290 KTM's. And if id only be able to have one bike, and 80% seal 20% gravel id definitely go for the SAS 1290, or an 890R KTM, no question. The Multi's, and especially a V4 Multi is not suitable for gravel. On a recent trip, 4 Multi's 3 950S's and 1 V4, the guy dropped his V4, a slow tip over, and $4500 to fix the damage. KTM's are built bloody strong, low centre of gravity makes them great all-round bikes. And unlike you, i don't like multi cylinder bikes. Twins for me all the way. Ive owned a few V4's, even ridden the Street Fighter V4, (very disappointing bike) The 950S Multi's aren't to bad on light gravel, weighing in at 230 kgs fuelled up, they aren't light, i believe the V4 Multi pushes the scales at around 250kgs fuelled up. Pick of our gravel trip on multi's, the guy with the V4 broke his ankle and couldn't get off his bike. View attachment 1062197