do you even know why people run PCT in the first place? It's to restore natural testosterone production that was suppressed during the steroid cycle. If you're on TRT, that means you're not producing your own testosterone, and you're not going to unless you discontinue TRT. That's why PCT is not necessary.
And what do you mean you shouldn't be doing TRT for an extended period of time? Why did you start in the first place if you weren't making a lifelong commitment? TRT is meant for those who do not produce a normal amount of testosterone. If your body produces testosterone adequately, you shouldn't have been prescribed TRT. If your body does not, you should stay on TRT long term. Is your TRT prescribed by a doctor?