Multi-step migration in SQLite with 'MODIFY'

I'm trying to create a multi-step migration in SQLite. First an alter to add the field (nullable), then a CONCAT to amend the field, lastly alter to make it non-nullable. I'm getting The supplied SQL string contains more than one statement. Not sure if I'm thinking about this the wrong way...

Trying to split up the migrations into three step, but it seems like the last step (ALTER TABLE table MODIFY) to apply the not null constraint is not permitted in sqlite... I'm not sure how to handle this.

Any ideas?
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