Oil Over Enamel and Acrylic

That depends upon your thinner. A mild thinner like Mona Lisa brand,will not attack your enamel base coat once it has dried and cured. Some stronger ones will. I suggest that you experiment on an old model with the supplies you have before trying them out on your Mk.1 project.

Test it. With the enamel there's a real chance of making a mess. I rely on an acrylic clear coat before oils washes.

Generally only use oil over acrylic.

I have used Oil washes on enamels, once sealed with a clear laquer. No issues.