Best bike with foot brake
A coaster brake is really your only option for foot-operated braking, and most complete bikes sold with coaster brakes have the coaster as the only brake. My experience is that mixing hand and coaster brakes takes some getting used to, and most people don't want to bother.

This limits the selection of coaster brake bikes to mostly cruiser and city bikes. Most of those are single-speeds or 3-speeds. Both Shimano and SRAM offer 8-speed internally-geared hubs with coaster brakes, but I don't know whether any current production bikes come with 8-speed coaster brake hubs from the factory.

If you wanted to have a more versatile bike with a wide range of gears and a braking setup that includes a front brake, one way would be to have a rear wheel built using one of the 8-speed hubs. The considerations for that include:


The frame would have to be able to accommodate an internal or single-speed rear hub. This means it would have to have either horizontal/track type dropouts or an eccentric bottom bracket.
Most internally geared hubs are limited to one chain wheel in front and one cog in back, so you're limited to the number of speeds inside the hub itself.
Both the Shimano and SRAM hubs come only in 36-hole drilling, not the more popular 32-hole. This would somewhat limit your rim choices.
The derailleurs, chain wheels and cogs from the derailleur drivetrain would become surplus, along with the rear brake and its lever.


If you wanted to start with a bike that's really close, the Breezer Uptown 8 or Downtown 8 come with 8-speed hub gears and hand brakes for both wheels. You could purchase the coaster hub and have a bike shop rebuild the wheel, keeping the rim, shifters, cog and chain wheel. I wish I could say that you could just buy a kit to convert from one type of brake to the other, but to my knowledge, the hubs have different internals. Current cost would be a $600-800 bike, $200+ hub, plus labor. You could probably sell the old hub and get a little bit back.

Another option might be to get a cruiser with an 8-speed hub and add a disk brake, but this would require replacing the fork and front wheel. Probably more cost-effective but more of a challenge to find a compatible fork. Too many variables to estimate what that might cost.

Good luck in your search.