Based on the provided information, there is no content available to evaluate the film's portrayal of LGBTQ+ characters or themes. Consequently, a specific assessment of its net impact cannot be made.

The film, an adaptation of Noël Coward's play 'The Vortex,' explores themes of drug addiction and family dysfunction. Available plot summaries and historical information do not indicate the presence of any transsexual characters or themes, leading to a determination of no depiction.

The movie does not contain any action or adventure elements.

The 1964 adaptation of Noël Coward's play "The Vortex" maintains the original genders for all established characters from the source material. No character canonically established as one gender is portrayed as a different gender.

There is no available information regarding the source material or character origins for the 1964 film "A Choice of Coward: The Vortex" to determine if any character's race was canonically, historically, or widely established as different from their on-screen portrayal.