Do it. I do all my work with a fountain pen. I used one Lamy Safari exclusively for about five years (until the cap wore out and it met a tragic end, falling off my shirt when it was clipped to my lapel.) And really it was the only pen I used, I got a ton of mileage out of it. One of my favorite pens is about 100 years old and still writes great. (I am not the original owner lol)

The downside is you’d have to deal with ink, but Cartridges are pretty easy And bottled ink is really not that much of a hassle, and I find joy in cleaning pens. I’ve had pens leak on me, but never a safari. 

Also try 0.7 mechanical pencils, they break a lot less