How can I substitute Tender Quick® for pink salt + kosher salt?
This question is almost entirely a duplicate of this one on corned beef, sodium nitrite and Tender Quick..  Please see the answers for that question.

The only thing not covered in that question are the proportions of salt, sodium nitrite and sodium nitrate in Tender Quick.  You would need to calculate those ratios, and compare them with the ratios in pink salt + kosher salt called for in the recipe.  This information is not available on the Morton's web site; you will have to call them to get those proportions.