WordPress Temporary Redirect Setup

I need a clean, reversible way to send traffic from my current WordPress site to another destination without harming SEO or breaking internal links. The redirect must be temporary (302 or 307—happy to follow your recommendation) and easy for me to turn off when the campaign ends... (Budget: $15 - $25 USD, Jobs: Apache, Nginx, PHP, SEO, Web Development, Web Hosting, Website Optimization, WordPress)