IMO messing with Ikea cabinets is a bad idea it voids your warranty to start and often I use the wall cabinets for base ones if depth is an issue and I think Ikeas new Sektion line has some shallower base cabinets. I am not sure I understand your issue but if you can’t exceed 24’ why not just do the regualr base cabinets with no counter overhang at all.

The space for the wet bar is too tight; 16 inches leaves me enough room to add a sit/stand bar table to drink at. Functionally, if my wet bar counter with small sink was 16'' depth then it would work well.

Their wall cabinets are 15, could that work? I can't imagine a functional sink that would fit in that space... I see no real issue with reducing the depth of their standard cabinets if you are handy but you would lose the ability to have drawers etc...

Actually they have 14.5" cabinets with drawers... the sinks cabinets do not have drawers though.

Thanks!

Would a trough sink work, for instance these come 10” wide and in various lengths and finishes. This line is expensive but I’m sure there are lots out there

https://coppersinksdirect.com/trough-sink-ta-copper-trough-for-bath-or-bar/