Based on the information provided, there are no identifiable LGBTQ+ characters or themes present in the film "H.P. Lovecraft: Two Left Arms". Therefore, the net impact on LGBTQ+ portrayal is N/A.

The film "H.P. Lovecraft: Two Left Arms" does not feature any identifiable transsexual characters or themes. Its narrative focuses on various elements of body horror, cosmic dread, and psychological terror, without engaging with gender identity or transsexual experiences within its plotlines or character arcs.

The movie does not contain any action or adventure elements.

The film is an anthology inspired by H.P. Lovecraft's works. Key characters adapted, such as Randolph Carter and Erich Zann, are portrayed consistent with their established male gender in the source material. No instances of canonically established characters being depicted as a different gender were found.

This film is an original horror anthology loosely inspired by Lovecraftian themes, not a direct adaptation of specific stories with canonically established characters whose race was explicitly defined in source material. Therefore, no race swaps occurred.