All addressing in C is by the byte as the smallest unit (sizeof(char) is one by definition). You can't take address of a bitfield, or sizeof a bitfield. So, no array of bitfields. But underneath, bitfield access involves a shift-and-mask in any case, so there's no problem with explicit shifts like n = (uv >> (6*i)) & 0x3f.
As far as tricks go, well you might use fd_set and related macros for a small array of booleans, but that could be seen as a slipshod misapplication.
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