The only issue of “tonsuring” would occur traditionally with Christian monks where the haircut was part of becoming a monk. There is no tradition of objecting to people selling their hair for money based on what they wanted to use the money for (whether it was to buy food, or give to the poor, or donate to an avodah zarah). If we object to someone doing something to earn money in order to donate the money to avodah zarah, it would be very difficult to ever hire or buy things from non-Jews, since by doing business with them, we would be indirectly supporting their avodah zarah (or other nefarious practices).
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