VICKERS-RV1-8-S-0-20/8

For high-pressure harvester applications, 350 bar (5000 psi) is exactly what this valve is rated to handle. It's a poppet-style pressure control valve, which tends to be more reliable and leak-resistant than spool types under those kinds of demanding conditions. The compact footprint is one of its stronger selling points, so fitting it into a tight manifold setup is very doable. Flow capacity tops out at 300 L/min (80 USgpm), so as long as your system stays within that range, this valve is a solid match for what you're describing.

This Vickers RV1-8 series valve is designed for use in demanding mobile and industrial applications, including harvesters and refuse haulers, so it should work well for you.