I think the seat heat controls are on the center console, so yeah, that'll have to come out. There should be two (or more, depending on what options yours came with) blanking plates on there. Mine's got everything but, and the front two spots are blanked. You can pop out the plates, pop in the factory switches, and iirc they'll plug right into the harness. They might be tucked in/under the carpet or other wiring, so dig around a little. The console's a bit of a pain to get out, but one or both seats are also out, it'll go a lot easier.
No idea on the timer, though, unless that's part of the switches. You could check the online Factory Service Manual wiring diagrams.
Full interior replacement's not a bad idea. Smells seem to like WD interiors. I spilled some pine-scented kerosene (long story) on the cargo area carpet once, tried to spot-treat, took it out, pressure washed it, vacuumed it dry... and a year later it still smells. Oh well, better than cigarette smoke, anyway.