The short answer is ... I do not think you can.
Since you import the .css file here directly, you are using a compiled style sheet, so fewer variables will not help you. I see one of two ways to solve this problem.
1) Create your own stylesheet, which then imports fewer files from these libraries. I do not recommend this option since you are not using less yet.
2) Override the font yourself in your stylesheet. Since you use stylized components, you can use the injectGlobal parameter to achieve this.
jerelmiller
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