disbudded wethers with horned pigmy buck... safe or stupid?

Just moved from the city - I have had two Nigerian Dwarf wethers for a couple of years that love to agressively butt heads... now that I have some land, would now like a small heard of Pigmys. I'm finishing up a buck pen (50x50) and an adjacent small pasture for a few girls (1.5 acres for now). I'm getting ready to fence another 1.5 acres but planning on rotating the girls between the two and not using both at the same time. Pasture has tons of near-perfect forage for goats but 50% is occasionally a little wet.

Three questions from a newbee,,,

Is it reasonable/safe to introduce a horned pigmy buck to live with the disbudded weathers in the buck pen?

Given plenty of land that is dry year round, how worthless (for goats) is the wet part of the pasture?

What number of pigmy does is reasonable on 1.5 acres?

Thanks in advance!