One neat way is to mount a
galley stove with an
oven.
When it is too rough, bake in the
oven.
Food in the oven makes for a lower CG. And the oven has a lock. And so, it cannot fly across the
cabin.
It is also about your boat. It is a
hull very prone to jerky and rapid movements from wave impact. We are sailing a much smaller (but narrower and deeper) boat and there is no problem cooking in the conditions you described.
ALAS we do not cook with rough beam-on seas - if and when sailing with the
galley up. (We have the Atlantic side galley - on the port side, no problem cooking on the Atlantic passages or sailing
Caribbean S to N).
cheers,
b.