Anything over 1mm is typically wide. It won't say it. Sadly Italic nibs are pretty rare, but the grind is awfully similar. The best italics are usually ground by a nib meister. I would recommend trying a 1.1 to 1.5 stub first, and see if it is what you are looking for in terms of writing. Easiest and affordable is a TWSBI GO, but I prefer an Opus 88 Mini, but you have to fill them with an eye dropper. Better for calligraphy because you won't fill it often, lots of ink. The small size of the mini is comfortable for long sessions and thick at the grip for control. But as an artist of your sort, you may want a more calligraphy style pen like the Lamy Joy, which has a body with which you are familiar plus an italic nib that you can change out. It takes cartridges or a converter.
Lamy Joy