Greetings from a fellow Swede. Välkommen, and thank you for your introduction.
Layering different fragrances isn't a blasphemy. A lot of people here do it.
I generally don't buy deodorants or to match my scent. Most of the time I use an unscented one. My shower gels are perfumed though and sometimes they clash a bit with what I'm wearing. Unscented shower gels are just so dull.
What disturbs me most is the scent of fabric softeners. They are usually very strong and sometimes overwhelm the smell of the fragrance I'm wearing, so I only use a bit of softener or none at all.