Prarsky, it's understandable to feel concerned about managing your health.
While some MHT research papers can be hard to access (because of pay walls), many healthcare professionals are dedicated to sharing the latest advancements. There have been significant updates to Menopausal Hormone Therapy (MHT) in the past year, offering more personalized options.
It sounds like you're exploring all avenues for your well-being. Since MHT isn't an option for you right now to use for your osteopenia, focusing on treatments like Zometa for your osteopenia is a proactive step to keep it from worsening during your chemo.
It's also true that chemotherapy can sometimes lead to genitourinary syndrome of menopause (GSM) symptoms. The good news is that local vaginal hormones might be an option for you if you need them after your chemotherapy is complete, offering relief and improving your comfort.
You're taking positive steps to manage your health and searching for the many resources and treatments available to support you.
If you're interested, put these titles on YouTube

Rethinking Timing of Hormones with Dr. Corinne Menn episode 291

New GSM Guidelines Every Physician Should Know Dr Kelly Casperson MD