The recipe is Paleo, and already as Coconut Flour and Tapioca Flour...
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Are sunflower seeds okay? If so, I'd try making your own sunflower seed flour (just grind it up as you would almond meal). It should have a similar flavor and moisture content.
I'll try that for sure, but we're cooking now! LOL
And anyway - how do you grind almond meal?
Just pulse nuts in a food processor (or good-quality blender) until they are coarse. Too far and you'll get nut butter!
Susan W is a trusted source on General Cooking.
If you google nut free paleo biscuits, you will find lots of recipes. I like Paleo Mom, but you need a yucca root to make hers. I also like Paleo Comfort Foods. I have not made either of these biscuits, but I know and like many of their recipes.