As far as I know the 388 has balanced input mic preamps so your regular DI box will work just fine as long as it's passive (no phantom on 388).
Worst case the signal will have opposite polarity to what you're expecting, as you say, but this is true with pretty much any preamp, mixer, cable, adapter, microphone, etc.
If you're using the DI box for some instrument like bass or e-guitar then polarity isn't really important.
It matters if you record something with two paths - two microphones or dual outputs -
and even then you'd likely use a dual DI or matched pair so they'd be correct to each other anyway.
Many DI box will have a polarity switch which simply swaps 2+3 around.
If you your recordings to digital at any point polarity can easily be flipped there too.
You could also make a little xlr-xlr with a DPDT switch so you always have a polarity-flipper on hand, if you think you're likely to need that.