I'd chance my arm with one of the Sunons over the Noctua, but I understand what you're getting at the moment you open the enclosure.
In terms of modularity while YTC and HZ Mod seem to come highly regarded, I'd have to consider the tradeoff of need versus my rights and ease of recourse under consumer law. I don't know what kind of QC these mods are held to, and whether you'd even be able to sell them commercially in the EU. I can only imagine recourse through AliExpress or TaoBao to be more tortuous than from a UK or EU vendor.
Modular would be nice - but I don't want to blow myself up, or my house burning down.