Create one rule to maintain multiple URLs - iis

Question

Windows Server 2012
I have 1 IIS container with 4 different URLs for one domain and 2 domains in total as below (set with the bindings)
www.site1.com
site1.com
www.site1.co.uk
site1.co.uk
www.site2.com
site2.com
www.site2.co.uk
site2.co.uk
www.site1.com - is the primary domain, meaning any combination of the URLs above must take the user to www.site1.com or www.site2.com
Below is the config i have for site 1 but site 2 is essentially the same. www.Site2.com not listed for brevity
<rule name="site1CoUk" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="site1.co.uk" />
</conditions>
<action type="Redirect" url="http://www.site1.com/{R:0}" />
</rule>
<rule name="site1WwwCoUk" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="www.site1.co.uk" />
</conditions>
<action type="Redirect" url="http://www.site1.com/{R:0}" />
</rule>
<rule name="site1Com" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="site1.com" />
</conditions>
<action type="Redirect" url="http://www.site1.com/{R:0}" />
</rule>
Everything seems to work but is there a way to reduce the configuration so i can maintain it within one rule (or 2 rules if i add in the www.site2.com). So i did something like this
<rule name="site1CoUk" patternSyntax="Wildcard" stopProcessing="true">
<match url="*" />
<conditions>
<add input="{HTTP_HOST}" pattern="site1.co.uk" />
<add input="{HTTP_HOST}" pattern="www.site1.co.uk" />
<add input="{HTTP_HOST}" pattern="site1.com" />
</conditions>
<action type="Redirect" url="http://www.site1.com/{R:0}" />
</rule>
but this doesnt work as soon as i add the second HTTP_HOST pattern.
The main reason is as i add more URLS it would easier to maintain under a one rule rather than adding a new rule each time round? Eventually the site would become https so i assume i could change the URL.