Thanks for your response guys, but sadly it looks like what I’m after doesn’t exist😥
I suppose it’s to be expected, after all it’s a niche scale in a niche segment of a niche hobby😂

RC4WD was the company I was thinking of, and looking at what they offer a bully2 moa kit might just be what I’m after, if I can work out how to mod it to 4wheel steer...

Thanks again for your help, it’s much appreciated,

Smokey