I have another question I don't know if it's in your field
How easy or difficult is to manage two vm-templates with one administrator panel and one virtuemart panel?
If it's easy how can i do it?
Thank you for your time
I won't recommend you to waste your time on it.
Migrating 2 templates (2 virturmart templates or 2 joomla templates, doesn't matter) is no difference than building a template from scratch. Without knowledges of PHP, CSS and little bit JS; you can't avoid conflicts and layout issues.