Reuse Flex Grid breakpoint layout AND Item settings on existing pages?

[pacstar]

I am using WYSIWYG Web Builder 21 and updating an existing site with many navigation pages built with Flex Grids. Each page already has its own images, text and links.

I would like to configure a two-column navigation layout at a 480px breakpoint once, then apply that configuration to the existing pages while retaining their current content and their Default/800px layouts. I do not want to duplicate a master page and manually replace every image, label and link.

In our tests, saving/applying a custom Flex Grid template reproduced the grid arrangement, but did not reproduce the required Item settings for each named area, such as flex direction, justify content, align items, align content and wrapping. We also tried the Default breakpoint template, but it did not solve the Item-settings issue.

Is there a built-in way to save and reuse the complete Flex Grid configuration, including the Item settings, at a selected breakpoint on another existing page? If the area names match, can the existing content remain attached to those areas?

I understand that Apply these breakpoints to other pages adds the breakpoint widths without copying the layout. Is there another command, preset, or supported workflow for copying the full layout and Item settings without replacing the existing content? If not, what is the recommended way to make this change efficiently across many existing pages?

The goal is to keep the native design view consistent with browser preview, rather than use external CSS to rearrange the output. Thank you.