Reclaim refrigerant when lowering blower speed ?

Blower speed/airflow impacts refrigerant charge for sure - if the charge was checked (superheat/subcool readings among others required, not just pressures) and adjusted correctly, you have nothing to worry about.

I say this because slowing down the blower would make the refrigerant pressure lower. You usually wouldn't want to make it even lower than that by removing some of the refrigerant.

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When there's a fixed orifice, it's important to make sure liquid doesn't return to the compressor and refrigerant may need to be removed after slowing the blower to prevent that and get the sh in the range the manufacturer wants.
equipment is not charged based on pressures.

it is a fine balance because the coil can't be run below freezing - but if there's a risk of freezing at normal return air temperature/load and proper charge though, the blower speed is set too low.