That's a rare one.
Some or all of these ideas may not be viable for your specific file but I'll offer them anyway.
1. Find a trap that does not rely on the second line.
2. Edit in a valid dummy trap at the top of the report and see if that makes things possible..
3. Edit the report to remove the unwanted pages or to extract just the section you require.
4. Use Monarch to produce a new version of the report as per suggestion 3 and then model what you need on the resulting output file.
Those are some generic suggestions. Anything else may well need sight of the report in order to attempt to spot a data or format based opportunity to approach the template mapping avoiding the second line selection issue.