Three possible bikes for you, but none are perfect (based on your criteria).

Linus Mixte 8 (doesn't have disc brakes) - $830
https://www.linusbike.com/products/mixte-8

Specialized Sirruss Elite Alloy (no IGH) - $1000
https://www.specialized.com/us/en/wo...rough/p/129190

Tout Terrain Metropolitan Shopper (too expensive) - $more than you wanted to spend
https://www.en.tout-terrain.de/bicyc...litan-shopper/

Or have a little more fun and build one out for yourself. It would probably cost a little more, but the end results will be perfect.

Soma Buena Vista Disc (mixte frame) - $600
Buena Vista Disc Frame Set | SOMA Fabrications