I'm with TrashBytes.
Barring a most unusual confluence of events that would border upon the supernatural (in the nearly lovecraftian way), I do not imagine myself *ever* having to deal with She Who Must Be Obeyed.
I've never had the impulse, never understood the draw, and do not see an upside. I am perfectly content being single and not looking.
And as a consequence, I have a projects room with server equipment that sounds like the runway at a delta hub, with nobody complaining about either its ugliness, or its loud racket.
But in all seriousness, assumimg SWMBO is in any way sensible or equitable, just be level with her about your collection of nerdy guy things, and in return, dont be critical of any of her very prominent girl things. Make a sensible agreement together that your hobbies and intetests stay in their areas and out of the shared living spaces, and just generally accept things.
Then you can have your upstairs room full of retro treasures, and she can have whatever she's into in her refuge of choice.
Sadly, I've observed that most couples can't actually do this, with the agreed taboo getting broken the instant shared finances intersect, and an expensive indulgence is sought, leading to tit-for-tat, followed by arguments...
Again though, my most sincere suggestion is to be aware of things like this, have a wholesome and respectful relationship with your SO, and come to workable terms together that will remove this, and other sources of contention in your relationship. Everyone *needs* a sense of autonomy and self actualization/fulfillment/empowerment in life, and *cannot* be wholly subsumed by a shared concept of 'ours'. It makes people unhappy and unfulfilled. Being honest, and sincere about this, and genuinely reciprocating this acceptence with each other is one of the secrets of an actually healthy relationship.
'Hiding' your nerdy collection is really not healthy, nor wise. You really cant keep such secrets, and if you try, you'll just be unhappy. It's defacto going to great lengths to conceal an important part of your self identity from your partner, to present what you think they will find as an idealized one instead. Not healthy in any way.
Your hobbies should be fully known, and accepted, even if not shared.
The converse, should be likewise.