There is no reason not to take appropriate oestrogen replacement for vaginal atrophy. My GP never queried my past history when he prescribed 'ovestin'.
Who gave you the impression that this isn't suitable for yourself? Quality of Life is so important, once the initial 2-3 weeks nightly loading is done, many find that symptoms can be kept under control by insertion every 3rd and 5/6th nights. What you are using will not replace oestrogen which is the usual reason for atrophy starting.