Mic versus Line inputs when using DI boxes

When mixing live sound and in particular using DI boxes with keyboards I have
always used the mic/XLR channels. However I would like to know if I could instead
use the line/1/4" jack 'stereo pair' channels. This would free up precious mic channels.

I guess I would have to make up some adaptors to convert the multicore XLR tails to
1/4" stereo ? jacks, also would the phantom power still be available doing this ?

Hope this makes sense, thanks for your advice
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