As for a true psychedelic that is legal you only have a few options really. Mescaline containing cacti are legally available in various forms most places I believe, usually in the form of dried San pedro chips. The difficulty with this is managing to consume the large amount of cactus material required to trip (around 30g dry San pedro I believe, don't quote me on that). As for 'mild' though I think this is your best option, mescaline is a very easy going psychedelic in low-mid doses with MDMA like qualities, and an earthy, natural warm feel.
Another option is LSA containing seeds like Hawaiian baby wood rose or morning glory which can be ordered from online head shops in most places. LSA is closely related to LSD. This is easier to do than eating cacti but I've never personally taken LSA so cannot comment on how easy the trip is. I have heard a lot of people say the LSA experience is pretty difficult too so that's something you might wanna think about.
Also both the two substances above are known to cause a lot of nausea, more to do with the plant/seed material on your stomach than the actual chemical you're trying to ingest though
Another option would be psilocybin mushrooms, these aren't legal obviously but can be easily picked with a bit of knowledge at the right time of year depending on your location, also in the Netherlands, psilocybin 'truffles' (sclerotia) are legal, and depending on the country you're in these can often be ordered from an online Netherlands smart shop and pass through customs without trouble (I know this is the case in the UK). So this is a little more risky but IDK how much trouble you could get into for importing a box or two of truffles really, it's very insubstantial, I know many people in the UK that do this without hitches. The psilocybin experience itself can be on the more difficult side but makes an excellent beginner psychedelic IMO, it's what i usually recommend for first timers. The fact it only lasts 4-6 hrs compared to mescaline and LSAs 8-12 is favourable too.
Other than that your only option is ordering RCs from an RC supplier site. What's available will vary by country but I think the only 'good' option atm is 1p-LSD which I hear is very similar to LSD, but again I haven't tried it so I couldn't say.
Btw a psychedelic experience is nothing like an anti-cholinergic at all. Psychedelics will hardly ever make you 'see things' that aren't there, you will simply have distortions of real objects and see fractal patterning overlaid on objects. The psychedelic experience though is not taken seriously enough by people looking into trying it IMO and it is really really underestimated. The visuals and sensory alterations are really just a side effect of these substances and the main effect is a profoundly altered state of consciousness, though the visuals do become an integral part of the experience, these sensory effects alone are not usually what a psychedelic user is looking for. Anyway, good luck with your trip on whatever substance it is you decide to use