This is really true. I used to be a suit four days a week, basic biz casual on Friday (either chinos or grey wool pants with a buttondown shirt) and denim Saturday and Sunday type of guy. As a result, I found it hard to wear shoes like the whiskey balmoral wingtips as they didn't really work Mon-Thurs or Saturday-Sunday. I am now experimenting with wearing trousers with sportscoats and sweaters more (namely thanks to Epaulet) on Friday and weekends. As a result, "casual balmorals" like suede captoe balmorals or whiskey wingtip balmorals make more and more sense.
That said, when it comes to "sharper denim" looks (i.e. denim with a blazer), balmorals can work too
Sounds like a good idea; picking up the 990 is perhaps a better idea.