There are plenty of examples out there of "2 story yurts" Showing that you can place a yurt on top of a more traditional foundation.
Something you might consider to placate your husband is many yurt companies offer real windows, and you can add tongue and groove wood to the interior to give it a more solid feel. Or there are plenty of companies that do offer solid "yurts" with solid panel walls rather than canvas, which might also placate the husband.
I would agree with others than having a basement would add to the costs of a yurt significantly. Making it less of a cost saver doing a yurt. However a happy marriage is priceless. So finding a way to placate your husband can be important.
One way you might mitigate initial costs could be to build a yurt on a raised deck platform, like the 2nd picture. With the idea that you can add on the basement level after the fact. This would give your husband time to maybe get used to the yurt without a basement, and give you time between first investment of yurt and platform and building the basement.
Of course one big thing would be the land your planning to build on and what sort of building it allows dictated by terrain etc.