I saw a demonstration on my Instagram feed on how to apply oestrogen cream. She said throw away the applicator, squeeze the cream onto the middle finger reaching to the second knuckle, place inside and all over the outside of the vagina. Seemed a sensible method without the hassle of using an applicator. I find Vagifem, and Estriol smeared on the outside a great combination for me and definitely my preferred method.
Also if the pessary doesn’t dissolve it would fall out whole I presume, I’ve never had this problem but I know them to be extremely hard in consistency.