Steve - well done, indeed, to conceive of it and to now be following through. If/when it is thought useful to have a mechanism for donations (i.e. monetary as opposed to in-kind) please let us know, as I'd like to contribute.
For now, and fwiw, just a thought (which I realize you've likely already had):
My previous and long-time professional role was in intergovernmental affairs and international business development; I worked closely with the consular and diplomatic corps from many countries, for many years.
New York will likely be 2nd only to Washington (and perhaps even ahead of it) in terms of the number of foreign missions it's home to. While your concept is valuable and will be much appreciated, I'd say it's not something to be addressed at the Ambassadorial level, but I'm certain that Ukraine will:
a) have a large and well-staffed consular presence in New York, including perhaps a trade-and-investment unit as well as perhaps a socio-cultural-educational liaison unit, b) that will have at least some awareness of and contact with Ukrainian nationals studying in the region, and c) that would not doubt most appreciate your efforts, and might -- even in what are horrific days for them -- have ideas to support/facilitate the process.
I would think that bringing the Consulate General into this can't help but make it a more effective initiative. Again, excuse me if I'm stating the obvious, but I wanted to toss it out there.
Contact info below:
The Head of Mission is Mr. Oleksii Golubov, Consul General (addressed as "Consul General Golubov")Ukrainian Consulate General in New York (note: that it is a consulate general as opposed to a consulate signifies an elevated status)
240 East, 49th Street, New York
Phone: +1 212-371-6965 or 212-371-5690
Email: gc_usn@mfa.gov.ua
Website: ny.mfa.gov.ua
twitter.com/ukrinnewyork
(PS - if you can reach, or have any contacts in, New York State's government, particularly its "international relations" or "intergovernmental" or "protocol" officials, this might be even better, as those officials will very likely already be working with the Consulate...sorry, I used to know/be familiar with the 'org chart' there in NY, for the intergovernmental arm, but as often happens they have apparently re-organized since the last time I worked with them)