switch hitting during at bat

[bigcat151]

Under ASA slowpitch rules, can a batter change from right to left handed after a strike has already been called?

The situation is a natural lefty in my league decided he would try to bat right handed. He swung at the first pitch and missed badly so he decided to go back to the left side. He ended up getting a hit from the left side but there was a debate afterwards about whether this was allowed.

Thanks in advance.