Adding "include tpl" command through a hook

[Stas]

Hello guys,

I'm trying to customize some vendors theme without touching the source code.

But there are some places that I need to include some custom tpl file.

For example.

Here i'm including custom tpl code in clientareahome.tpl from a folder that contains tpls i've coded.

<!-- Custom tpl code in clientareahome.tpl -->
{include file="$template/customtheme/clientareahome-insert.tpl"}

 

Is there a way to include custom tpl inside a theme tpl file without actually editing the source code? maybe with a hook?