>>1261013A Linus Roadster is probably the most similiar thing you can get. That will give you a 3 or 8 speed internal geared hub, like that bike has, fenders, upright bars, reasonably wide tires, and a rear rack. It's nothing very high quality but they're decent enough, i've ridden one and somewhere quite flat I think they're decent. You could upgrade to a dynamo hub wheel & led running lights later if you wanted.
If you wanted something special, more aesthetic to a discerning eye, I would look for a high end sport-touring bike used (something with decent tire clearance), and then convert it to upright bars and bar end shifters. Velo orange have a wide range of reasonably priced upright bars you could use
https://velo-orange.com/collections/handlebarsand Nitto make fancier ones. You'd need new bar end shifters, cables, possibly a stem and possibly brake levers also, plus just generally overhauling the bike. If you managed to find a good enough project frame you'd have something much sexier than a tig welded linus.
