If it gets used a lot, it might be worth linking it to a character sheet so that whoever has the spell can drag out the token on their own. If it isn't used that much, then just having a token in a convenient spot in your art library is probably sufficient. I'm not sure what system you are running, but it attacks based on the caster's stat in Pathfinder 1, so we have the attack built into the spell. Since the attack is rolled from the caster, there is no need of any macro assigned to the spiritual weapon token. Might just need to try a couple things and see what you prefer.