I would never recommend octave notation in violin music.
Unlike piano, a violinist has no easy mapping from one octave to another—you can't just shift your hand and read the same notes, so as long as you're playing extreme, uncommon fingerings, you can just as easily read the corresponding extreme, uncommon staff lines. Your example would go up to 6 ledger lines, which isn't that remarkable for a professional first violin part, but even if it were more, 8va wouldn't make things easier forhelp the player. Even if you justify 8va, 15ma is overkill.
Octave clefs are non-traditional for most instruments.
The canonical function of octave clefs is to render explicit the transposing nature of instruments like the guitar or piccolo. The little "8" isn't really meant to be read, and I've seen it argued that it's too subtle to expect anyone to notice—a little ridiculous in a practice that involves counting ledger lines, but what do I know. Prefer 8va brackets, and if you must use clefs, consider calling it to attention the first time it comes up, especially if it's meant to be sight-read.
I'm of the opinion that traditions are made to be broken and tools are made to be used, and octave clefs can be useful—on instruments where they're helpful to the musician, like keyboards. As a violinist I would see a big red flag that the composer was unfamiliar with the instrument and its limitations.
As a final note, it's 15ma, short for Italian quindicesima, as 8va is short for ottava.