"I am the third, non-biological, parent to my other kid"
"and he wasn't included as a child of the marriage in the divorce proceedings."
No, I do not think you are limited to the 1,690 for divorced parents.
If the child was not part of a divorce, you would not be considered that child's divorced parent.
I cannot figure the logic of limiting a divorced parent's contribution, but there it is. Perhaps to discourage parents from moving taxable income to the child's account simply as a tax shelter.
"The 2021 annual subtraction for contributions to a Wisconsin college savings account is $3,380 ($1,690 if married filing separate or a divorced parent). This limitation applies to the person who makes a contribution to the account. A beneficiary may have multiple contributions made to their account for the year and the total of all contributions may exceed $3,380."
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