I would suggest that you go with a seasoned professional like RickP - review: https://www.daddysreviews.com/search/Active/rick/rick_p_nyc
Explain to him what you want and he will deliver. Also a nice guy, which is always a good thing.
Same is true for Eric Hassan - review: https://www.daddysreviews.com/venue/usa/new_york/eric_hassan_nyc
If you have never tried poppers, let Eric introduce you - he is our resident expert.
Honestly, the first name that came to mind was Kevin Slater (@Kevin Slater) but he is a big boy - only if you are feeling adventurous!
You will struggle to do better, IMHO.