The expression
\[2 \sqrt[3]{3 \sec^2 20^\circ \sin^2 10^\circ}\]can be expressed in the form $a + b \sec 20^\circ,$ where $a$ and $b$ are integers.  Find the ordered pair $(a,b).$
We want integers $a$ and $b$ so that
\[a + b \sec 20^\circ = 2 \sqrt[3]{3 \sec^2 20^\circ \sin^2 10^\circ}.\]Cubing both sides, we get
\[a^3 + 3a^2 b \sec 20^\circ + 3ab^2 \sec^2 20^\circ + b^3 \sec^3 20^\circ = 24 \sec^2 20^\circ \sin^2 10^\circ.\]From the half-angle formula, $\sin^2 10^\circ = \frac{1 - \cos 20^\circ}{2},$ so
\begin{align*}
24 \sec^2 20^\circ \sin^2 10^\circ &= 24 \sec^2 20^\circ \cdot \frac{1 - \cos 20^\circ}{2} \\
&= 12 \sec^2 20^\circ - 12 \sec 20^\circ.
\end{align*}To deal with the $\sec^3 20^\circ$ term, we apply the triple angle formula $\cos 3x = 4 \cos^3 x - 3 \cos x.$  Setting $x = 20^\circ,$ we get
\[\frac{1}{2} = \cos 60^\circ = 4 \cos^3 20^\circ - 3 \cos 20^\circ.\]Dividing both sides by $\cos^3 20^\circ,$ we get $\frac{1}{2} \sec^3 20^\circ = 4 - 3 \sec^2 20^\circ,$ so
\[\sec^3 20^\circ = 8 - 6 \sec^2 20^\circ.\]Thus,
\begin{align*}
&a^3 + 3a^2 b \sec 20^\circ + 3ab^2 \sec^2 20^\circ + b^3 \sec^3 20^\circ \\
&= a^3 + 3a^2 b \sec 20^\circ + 3ab^2 \sec^2 20^\circ + b^3 (8 - 6 \sec^2 20^\circ) \\
&= a^3 + 8b^3 + 3a^2 b \sec 20^\circ + (3ab^2 - 6b^3) \sec^2 20^\circ.
\end{align*}We want this to equal $12 \sec^2 20^\circ - 12 \sec 20^\circ,$ so we can try to find integers $a$ and $b$ so that
\begin{align*}
a^3 + 8b^3 &= 0, \\
3a^2 b &= -12, \\
3ab^2 - 6b^3 &= 12.
\end{align*}From the first equation, $a^3 = -8b^3,$ so $a = -2b.$  Substituting into the second equation, we get $12b^3 = -12,$ so $b^3 = -1,$ and $b = -1.$  Then $a = -2.$  These values satisfy the third equation, so $(a,b) = \boxed{(2,-1)}.$