Bless weapon+eschew I

[Pibemanden]

Eschew I doesn't remove the "a holy symbol must be worn" component for this spell.

[Dorganath]

This is as-intended.
  As a paladin, you really wouldn't have a good IC reason to remove the holy symbol of your deity. If there is some ability/bonus amulet that you would like to wear, you can have the amulet consecrated by a cleric so that it functions as a holy symbol and provides the bonuses.