the hormones might not be stored properly.

if you're ordering pharmacy stock, you don't really need to worry about that. they'll only be in transit for a few days if you order from within the EU and for patches, pills, or gel, there are no special requirements like refrigeration or anything.

Secondly, I can't be sure which supplier to trust.

this is an understandable hurdle to get stuck on. https://hrtcafe.net/index.html#pharmaceutical-vendors is the best centralised resource for reliable vendors. the least stressful option is going to be buying from an EU supplier that takes bank transfer, as customs is highly unlikely to be an issue in the EU (general advice is to still only order ~3 months worth at a time), and bank transfer is less hassle than using crypto and you're not committing any crimes in the EU by doing this anyway. if you want, you can DM me and I can tell you about the supplier i've used before which is reliable and not listed on there. they take bank transfer and give you a postal tracking code which is nice. but just so you know i think they only have estradiol pills in stock currently.

I tried looking for options for importing from outside Europe

yeah, like i said your best bet is to go with an EU supplier as that all but guarantees customs won't be an issue. my supplier is based in portugal and i have never had anything seized (and i live on an island). i still don't really get what your worry is with it being affected by transportation, unless you were thinking about ordering injectables? i think even then, transportation conditions are not really a concern. it's highly unlikely your goods will be damaged and if you're ordering something like pills or patches or gel they're not fragile at all and can be stored at room temperature. even injectable vials are pretty hardy.

Ordering medicine online just seems rather ... sketchy to me.

totally understand feeling this way but once you've overcome the initial hurdle and received a few orders it becomes as routine as ordering anything else online. EU is a very safe zone to do this and you're not even breaking the law. the worst case of course is that something doesn't show up but that's never happened to me over dozens of orders, and i've never even heard accounts of it happening to anyone in the EU. if it did happen it would more likely just be down to the postal service being shitty than customs seizure or anything.

hope i helped at least a little and happy to answer any questions you might have as someone who has ordered HRT within the EU a bunch. the decision is yours but i strongly recommend you continue to look into it as a valid option as it's extremely powerful to be able to overcome the waiting lists and high costs associated with the bourgeois healthcare system. and the EU is one of the easiest places to do it.