because studies range from showing HRT helps a little to not at all at preventing suicide.

No they don't. There are a couple of studies that are deliberately misrepresented by transphobes to imply this, and they often get passed around as fact, by people who aren't familiar with the studies in question.

Firstly, there was this Finnish one https://mentalhealth.bmj.com/content/27/1/e300940

You can see more about the hatchet job that the New York Post did on that one here https://skeptics.stackexchange.com/questions/56772/does-gender-transitioning-do-nothing-to-help-suicidal-ideation

Then there is this one https://pmc.ncbi.nlm.nih.gov/articles/PMC3043071/. It's older, and it is misrepresented to claim that the suicide rate of trans folk doesn't change after transition. The thing about that study is that doesn't even assess the impact of transition. The entire cohort of trans people in the study were post transition, and questions were asked about their lifetime suicide attempts, without comparing before/after transition data. So because 41% of trans people in that study had made at least one suicide attempt at some point in their lives, the claim was made that transition doesn't help, because "41% of post op trans people have attempted suicide". The lead author of this particular study has spoken out several times on the misuse of the study by transphobes with an agenda, but to this day, it keeps happening...

So, let me give you the actual data...

https://whatweknow.inequality.cornell.edu/topics/lgbt-equality/what-does-the-scholarly-research-say-about-the-well-being-of-transgender-people/

This is a consolidation of the findings of research on trans health care, and the impact of transition on the well being of trans folk. To summarise, they looked at 55 studies on the impact of transition. 51 of those found transition to be beneficial, and 4 of them contained mixed findings.

You've stumbled on one of the tools that transphobes use. Deliberate misrepresentation of the facts, so that they can push for trans folk to be cut off from transition related healthcare, all whilst sounding reasonable, and sometimes even supportive. That, and trans people in sports, were the two main wedge tactics that they used to open the door to the wave of transphobia now sweeping the world.