Transclude content is Why you should use templates. Better see what Aleš is doing with the Ancestry template and the FindAGrave template with the new sameas parameter makes it possible to tell Project Database error dont generate errors....
Because of Aleš work it makes even more sense to use ätemplates much more Even when he has a bot that can do a lot. Problem with the bot approach is changing Ancestry bad links will take +3 weeks and with a template it takes 3 sec... one problem is Gedcom export but I feel as Wikitree lack events etc you have already lost so much by importing so one more thing is a small thing also what we speak about now is categories an not profiles
As we dont know what is happening with Swedish Churchbooks and that if they will be free. My hope is that it will happen and then I guess we will have another situation were we see how stupid it is not transclude content
But do what you want I feel complexity is something that should try to be avoided and check with Aleš if you have questions I feel he is the person with best wiki skills and understanding how to create a solution that is possible to manage...
I am out travelling but have said before that I can do a webhangout and train people how a template works its nothing more than a text substitute....
PS. https://www.wikitree.com/wiki/Space:CategoryInfoBox is Even more complex and use configuration compared to the SPC templates and is as I see it the only way to get some structure in the category project. And if Wikitree get a CategoryInfo template it will be very easy to change in SPC_Header to use it... I guess all the other categories in the Sweden project will need some more work.