<blockquote>
<p>Currently I have found that Debian only offers six GTK3 themes.</p>
</blockquote>
<p>For what it's worth, there are quite a few themes here: <a href="https://www.gnome-look.org/browse/cat/135/" rel="nofollow">https://www.gnome-look.org/browse/cat/135/</a></p>
<blockquote>
<p>My favorite theme, the only one that does not assault my eyes, is not available in GTK3 through Debian's package system.</p>
</blockquote>
<p>If you mean it's available for GTK3 (outside of Debian repos), you could just install it manually. You can install into <code>~/.themes</code> if you don't want to mess with package manager/system wide stuff.</p>

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