I'm skeptical about this. A small wiki doesn't really need the complexity of Scribunto for maintaining templates, it just makes the potential maintainer base smaller (there are way more people who can deal with complex wikitext than who can code in Lua). Borrowing Wikipedia templates seems easy, but in practice those templates tend to be so complicated that they often don't perform so well on a site with a simple setup like Wikispore.
Note 1. Scribunto is bundled in MediaWiki defaultly 2. One of the original purpose is to provide a library of string functions 3. Wikibase needs Scribunto to work.
Also users can still use wikitext template even if it is installed.
We need to reuse existing Wikipedia template (so that content can copy back-and-forth). See also https://wikispore.wmflabs.org/wiki/Greenhouse#Importers, which a large number of templates is proposed to be imported.
The point is, I suspect that will be unfeasible anyway, because many enwiki templates would render unbearably slow on a less beefy server. Shouldn't be hard to test that on wikispore-test though.
In many times, Lua modules behave better - this is why we introduce Lua. See https://www.mediawiki.org/wiki/Requests_for_comment/Scripting
And also, https://wikispore.wmflabs.org/w/index.php?title=Template:Citation/core&action=edit is very difficult to read and maintain.