The relationship between HRT and endo is grey- not black and white.
How old are you and where abouts in meno are you? (peri or post meno?)
This is from the UK endo support site
Will endometriosis come back if I take HRT?
There is not enough evidence to say whether endometriosis will come back when using HRT. It would depend on the individual circumstances. Women have taken HRT and not had a recurrence of endometriosis but as HRT contains oestrogen it can stimulate any endometriosis remaining after a hysterectomy
Any dose of HRT is still lower than what you had before menopause.
There is no evidence that anything helps, (I've read the report from the RCOG many times) as well as HRT.
There is some evidence that black cohosh may help but there are risks of liver damage in a small number of cases if used long term.
Some women swear by Menopace.
Ultimately, only HRT is proven to be effective, though some women who can't use it after cancer, are given SSRIs (anti depressants), though these come with their own list of significant side effects.
FWIW a scan I had a while ago showed evidence of adenomyosis which I was never aware of, but did have bad period pains as a teen. As will know, adeno is worse in some ways than endo.
I've used HRT for 11 years- my adeno isn't worse and my fibroid hasn't grown either.
In your shoes, I'd give HRT a try for a few months- nothing to lose as if you stop it, the endo will go away again.
If you are post meno and use continuous HRT then the effects of the estrogen are reduced by the daily progestogen anyway.