A new gender-neutral pronoun would be more meaningful
Individuals within the LGBTQ community should be given the chance to create a new set of gender-neutral pronouns, or make official use of the unique ones which have already been made. This would give people a chance to "own" their gender identities and have something unique which they can be proud of. There are already a ton of options for new gender-neutral pronouns out there; including, but not limited to, ze/hir, fae/faer, ve/ver, xe/xem, etc. All of these are unique and any of them would enrich the English language while also showing respect to those of a non-binary gender. Singular they/them is not a good choice because it would be too hard to adapt to grammatically. Changing the meaning of these words would only cause confusion for most people. Therefore, creating a new set of pronouns would be the better option, as it would be far easier to adapt to something new.
Singular they/them would be easier to adapt to than creating something new. Trying to introduce a new word into the English language would feel alien and people would balk at being forced to adapt to a foreign word. Singular they/them, on the other hand, already has a history of being used in a gender-neutral way; so to adopt it as a set of gender-neutral pronouns would feel more natural and be far easier to adapt to.
[P1] Creating or using a new set of gender-neutral pronouns is more meaningful and would be easier to adapt to.
Rejecting the premises
[Rejecting P1] Using something new would be more difficult to adapt to than using singular they/them as it is already a familiar part of the English language.