Are you not a practitioner if you contribute to the field...? Seems impossible to meet your criteria.
What's a pure philosopher? Are Frege and Decartes not philosophers because they also did math? Does Alan Turing count? What about Popper and Kuhn? Are they philosophy enough for the philosopher club? Where, when, how and by whom do you think the concept of 'empirical science' was derived?
To be clear, everyone, including scientists, do philosophy every single day. You don't think Darwin did some philosophy in on the origin of species?
The characterization of the scientific method as proposing hypotheses and then putting them to test was given by a philosopher in the previous century. While the hypotheses that this is the character of the scientific method is still very common, it was refuted long ago, both by observations and by logic reasoning.
Like I could literally go forever because most breakthrough practitioners started as philosophers- note the PhDs
“Doctor of Philosophy”
I mean JFC people this is basic science history
But you know I’m sure that won’t satisfy somebody who doesn’t even understand the epistemological distinction between what a philosopher is or does and what somebody who’s actually doing experimental testing that turns into something great is because the distinction is basically zero