Hi Peroxideblader
It sounds like if your doc is listening to your idea of the right dose ( quite worrying in itself as the information is all out there if she only looked for it) then surely she would take even more notice of Dr Currie's response?
If you wanted to consult her then best to give as much information as you can but briefly eg your age, what your periods have been doing (re cycle length), symptoms, any medication you're on, what your doc has prescribed you and your concerns - (eg side effects from oral use, and bladder problems from vaginal use) and then ask your question.
I e-mailed Dr Currie about coming off HRT before having a hysteroscopy due to unscheduled bleeding/spotting and her reply was really helpful, and my doc complied - although I went to a different doc with the reply than the first one who had told me to stop HRT.
I also earlier found some info on rectal use of progesterone but didn't post it as it wasn't specifically about Utrogestan but you might find it interesting:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5217976/Again it is in connection with fertility and in vitro fertilisation - and compares progesterone pessaries (the Cyclogest ones I mentioned) used rectally and vaginally, as well as utrogestan used vaginally.
You could also maybe ask Dr Currie whether she would recommend Cyclogest pessaries but you might find your doc unwilling to prescribe this (even if Dr Currie suggests it) as it is not licensed for HRT - although my local GP prescribed this for me for 4 years as I mentioned, until I changed to utrogestan.
Interesting link Taz also - but as you say it is concerned with PCOS. What I got from it was how variable absorption is from rectal use (this would be Cyclogest pessaries, not utrogestan) - but this is the case with any HRT both oestrogen and progesterone - that there is great inter-individual variability!
Let us know what you decide Peroxideblader, and how you get on

Hurdity x