Nice sink...go for it. Paint it gray? Leave it techno-pop-groovy-green?
Even if I have to carry water and drain waste to/from the adjoining laundry...
Some ideas...
My darkroom is like yours, where it's in a room adjoining the laundry room so it was easy to get water into the darkroom.
Not wanting to put in permanent plumbing, I put
Y shut off's on the laundry side, then used flexible stainless steel washing machine hose to get water to the darkroom. A couple small holes in the wall did the trick.
As far as drainage from the darkroom sink goes, I rigged some pipe & elbows to the drain on the laundry room floor. Lucky for me, the floor drain was about 6 inches away from the wall.
Not Darkroom Magazine cover photo material, but does the job on the cheap and if/when we sell the house the darkroom can easily go back to being a bedroom.