Any luck importing medication?

Hi all, I'm here to count on you when it comes to experience with and knowledge of the Japanese medical importation system (quite niche, I know!)

From everything I've read over the past year on the subject, Japan doesn't have the medication I use in the UK. Its alternatives are unsuitable.

So I'd need to either:

A) Import from within Japan using a Yakkan Shoumei (薬監証明) import certificate every 2 months or so

B) Travel to a place like Thailand with my prescription and bring the medication back using the 薬監証明

(Apparently compounding pharmacies are rare).

Have any of you had any luck whatsoever importing your own medicine for personal use?

Thank you in advance for your help. どうもありがとうございます。