Might a low-profile 3pdt fit? I use these for all of my 1590G builds and a lot of other stuff, and they’re a fair bit smaller in each dimension than a normal 3pdt, but they hold up well— they seem just as solid as the regular ones!
Visually they might not match up with the dpdt unless you get the low profile dpdt to match it, but I image it would be the perfect solution for the one that you need two 3PDTs for!
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Edit: not sure if this is for something with a daughterboard, but the low profile switches have a tighter pin spacing so they have to be hand wired. If a daughterboard is essential, then disregard the above suggestion