At the public middle school my children attend in Massachusetts, the daily announcements include the following:
Queer-Straight Alliance
Are you LGBTQ+*? Are you straight? Or do you just really like rainbows? Then come to the Queer-Straight Alliance! At QSA, you can join whether you are an ally or on the LGBTQ+* spectrum. You can talk about anything you’d like and we are all here to help and discuss. [...]
*Lesbian, Gay, Bisexual, Transgender, Queer, and more
Students who think they are homosexual or who suffer from gender dysphoria should not be harassed in school, and schools should have rules against such harassment. But I do think schools have crossed the line from anti-harassment to LGBTQ lifestyle promotion.
Queer-Straight Alliance
Are you LGBTQ+*? Are you straight? Or do you just really like rainbows? Then come to the Queer-Straight Alliance! At QSA, you can join whether you are an ally or on the LGBTQ+* spectrum. You can talk about anything you’d like and we are all here to help and discuss. [...]
*Lesbian, Gay, Bisexual, Transgender, Queer, and more
Students who think they are homosexual or who suffer from gender dysphoria should not be harassed in school, and schools should have rules against such harassment. But I do think schools have crossed the line from anti-harassment to LGBTQ lifestyle promotion.

is a humorous suggestion for them to actually use at the start of the announcement you might use.