I also want to scrap the big sink, long term, and put in something smaller. I think the big tubs are useful if you're soaking laundry, but that's about it. I don't soak laundry.
My long term plan is to make curving cabinet faces out of brushed aluminum sheet, with an aluminum or stainless countertop and backsplash. I'd like hot and cold controls for one spigot in the sink, and then a T-valve off of that on a line to a retractable reel so I can have cold or hot water to run outside or anywhere in the shop. I'll follow the same curved line up above for more aluminum-faced storage. If I can find a way to fit in a small dorm-styl fridge, that's be great.
When it's done, it'll be the one corner of the garage that's not green.