Go single speed!
You’ll have the pleasure of single speeding itself, with the added bonus of knowing that you’re giving Shimano something to think about.
The only part that seems to wear out is the chain (about £12 each every 500-1000 miles). I imagine one day I’ll need to replace a sprocket – but at £4 each I can afford it. As for chain rings – the Surly chainring I’ve got looks almost new.
I’m not even sure you go any slower than geared riders tbh, as so many of them seem to be completely ignorant of momentum. I’ve lost count of the number of geared riders I see stalling on quite gentle slopes – they’re just clueless.
And you spend less time cleaning your bike and more time riding it.