Dualit is in the UK and has been manufacturing high quality, hand built toaster for a long time, but most consumers would balk at the prices they ask for their appliances and I doubt you as a startup would be able to manufacture a toaster any cheaper.
https://www.dualit.com/collections/classic-toastershttps://www.dualit.com/collections/spares
Frankly, I don't even own one, in spite of being a champion of the "buy it once" mentality. But it's on the bucket list.
The waiting list is 10 months+ for a /24.
Only played with it for a little but it seems well designed an simpler alternative to ansible, chef and other such things.