Migrate WordPress directory (Voxel) to Next.js (Dirstarter) without losing SEO

I run a French SaaS directory and comparison site. It currently runs on WordPress with Elementor and the Voxel theme, hosted on xCloud, and it already gets solid organic traffic. Protecting that SEO is my number one priority.

I want to move it entirely to Dirstarter, a ready-made Next.js boilerplate for directory sites: https://dirstarter.com/docs/introduction

This is not a simple install. The boilerplate needs to be adapted to my site, and I want someone who will work with me on it from start to finish.

What needs to be done:
- Install Dirstarter on my xCloud server (Node.js) with a Postgres database, code on my GitHub
- Keep Dirstarter's design as a base and adapt it to my brand (logo, colors, fonts)
- Recreate all my Voxel custom fields in the listings, editable from the admin
- Import all content from WordPress: around [X] listings, categories, images, affiliate links and blog posts, with SEO titles, meta descriptions and content kept identical
- Build my "stack" pages, a page type that doesn't exist in Dirstarter
- Recreate static pages (about, contact, legal)
- Keep the same URLs wherever possible, 301 redirects for all the others, with a full old URL / new URL mapping
- Full crawl check before going live, domain switch, sitemap submission in Search Console
- Bug fixes for 2 weeks after launch

Everything is built on a staging environment first. We only switch the domain once it's fully validated.

After the migration, I'd like to keep working with the same person on SEO follow-up, new features and design changes.

Important: to show me you've actually read this, start your bid with the words "Voxel to Next" and nothing else on the first line. Bids that don't will be ignored.

In your bid, please include:
1. Your total price and estimated time for the whole project
2. How you would extract my Voxel custom fields from WordPress