EzekielRaiden
Follower of the Way
Which sounds wonderful! That's literally what I have done with my own players. Digging down to what they value, and finding a way to deliver that without a loss or reduction of what makes the setting great. That effort is, in my humble opinion, always worth it. Not just because it is the respectful thing to do when working with other people, but because doing so is precisely how you demonstrate that you value that player's participation, that you want them to feel welcome and appreciated, and (perhaps most importantly) that their genuine enthusiasm matters to you.I'll need to stress again that I don't curate my D&D list of acceptable races save for not allowing creatures that fly naturally. For me, this just isn't an issue that comes up when I run D&D games and is more likely to happen in other games. I've long been of the opinion that what race you pick in D&D doesn't make much of a difference one way or the other. That said, working with the player doesn't necessarily mean they get what they want. If dwarves are extinct in the setting, I'm not going to allow anyone to play a dwarf character. I'll ask them what it is about the dwarf they like so much and see if we can incorporate those traits into a character, but no dwarf.
I'm not much of a fan of dwarves myself, but to work with that example--perhaps something like, "Well, I appreciate both their literal marrow-deep resilience, to the point of stubbornness, and their culture of deep family and clan connections, and how that can be both a blessing and a curse." That is, something that is both cultural (and thus not necessarily tied exclusively to physiology) and something physiological (and thus not necessarily tied to any particular culture.)
For myself, I love both the general cultural outlines associated with dragonborn, and...well, their dragon-y nature. Dragons are just cool! I love dragons. I love the reptilian physiology, the elemental breath, the fearsome mien, etc. I can compromise on quite a bit of that, but there's gonna need to be at least a certain minimum tracery of it. I gave many examples of other ways such stuff could be achieved above (picking one random example, effectively "magical lab accident"), but maybe there's a tribe of lizardfolk that revere dragons, and I could play a lizard-person who is (or believes himself to be) actually "touched" by dragons--or who is hoping to become so, or the like. Or maybe shapechanged dragons interbred with humans a long, long time ago, and some rare throwbacks appear. That's a surprisingly common trope both East and West (though generally more Eastern, outside of D&D-derived media.) Or, especially for a more lighthearted-humorous game, maybe we could take a page from Cthulhu Saves the World and have a former nation-destroying dragon, cursed into a puny mortal form and forced to walk the earth as a hero before he can regain his natural form. Or...
There's a zillion possibilities, I'm just spitballing; I would absolutely expect you (or any DM) to provide their own proposals, and we'd collaborate to find something that makes both of us happy.