Hey there! Regarding the insurance company's requirement that you be on T... have you tried appealing this? Medical necessity can override insurance requirements. Meaning, if you can provide documentation that says that Top Surgery is medically required for you, regardless of whether or not you're on T, you may be able to still get coverage.
These resources may be helpful:
https://www.topsurgery.net/ftm-top-surge...e-tips.htm
https://www.topsurgery.net/resources/ftm...-guide.htm
While the WPATH Standards of Care (SoC) are recommendations and not rules, the SoC clearly states that T is not required for Top Surgery, so your documentation can include this, as well as letters from qualified mental health providers. The stronger your documentation, the better your changes are of winning an appeal.