Hi i have several sites that predate my use of your products the templates are from joomlaxtc and i doubt they will be updated to allow progression to Joomla 4

I maintain thes site and add content for some clients and was wondering if i installed helix ultima and Page builder Could I Gradulay Change the template over ie Like the blog and other areas so effectively the site would be using two templates ultimatly this would help reduce my workload in converting whole sites when it became neccssary or is this not a good idea