Metagrid templates

If you have Metagrid presets installed, you can load the attached Generic Remote templates to access them.

Can I modify this to be used in Streamdeck and Cubase Generic Remote not with Metagrid?

The Generic Remote templates define a lot of useful commands, some are standard commands available in Cubase but many are references to Logical Editor Presets that are available only if you have Metagrid installed.

Of course you can install the templates and do whatever you want with them. The standard commands are available for anyone. The Metagrid Logical Editor Presets need to be created manually if you don't have Metagrid installed, but they are pretty advanced so I don't think this is viable option.