Theme changing issues for Portfolio Custom Post Types

I’m looking to redevelop this client’s site, and I’m in the process of sourcing a new theme. We developed the existing site using Modernize theme from Goodlayers, which is about 5 or 6 years old now.

The client creates video content, so his portfolio index grid page of projects (currently here​) will become the homepage and would still need to be displayed as a filterable (by category) grid.

Primary Issue:

In addition to sourcing a new theme, I need to decide how the new site manages new and existing custom post types (CPT’s) for portfolio items. Will these be provided by the theme itself or by a plugin (e.g. https://en-gb.wordpress.org/plugins/custom-post-type-ui/)? My concern is that if they are managed by the theme, I will have this same issue (of migrating existing CPT content) that I currently have when I need to switch themes in another 5 or 6 years. So is it prudent to move portfolio CPT’s away from being theme controlled to being plug-in controlled? Your thoughts on this are appreciated.

Secondary Issue:

I need some good advice on mapping existing site portfolio CPT’s to the portfolio CPT that will come with the new theme (or plugin generated portfolio CPT). I’ve already started experimenting here. I’ve cloned the site and have it in MAMP on OSX. I’ve tested uploading new themes that support/offer portfolio CPT’s and can apply them to the site OK, but I then don’t see my old/existing Portfolio items (from Modernize theme) available anymore.

Part of the problem I’ve discovered is that the previous theme (Modernize) had post_type=portfolio whereas a new theme may have post_type=portfolio-item (I.e. they have different post-type)

I’ve been building WP site’s for many years but don’t often get to do a theme switch where some of the existing content are CPT’s. I assume I’m experiencing the same issue found here:

Consequently, I’ve invested in an import/export plugin (https://codecanyon.net/item/wordpress-awesome-import-export-plugin-v-24/12896266) that claims to assist in migrating data between post types. I’ve had some success with getting the title, content and featured image between the old portfolio CPT and the new one in the theme, but it looses the Portfolio CPT taxonomies and the video URL. If the Modernize portfolio CPT’s had a field for the video URL, do I have to find a theme with a portfolio CPT that also has a video URL field to map the data to? Or should I be using a plugin to create and manage the portfolio custom post type in the new theme, and that way avoid this problem in the future if I ever need to switch themes again?​

Appreciate your thoughts and advice on how I move forward with this project. I (& client) would rather avoid recreating ~90 portfolio CPT’s due to time involved and hence cost, so if we could automate/script this somehow it would be preferred.

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