Download link of IR, conditional field output means filters are ignored

Hi All,
I need to have a report on screen where the user applies filters, then when they've finished, they extract a subset of the on-screen fields to csv.
The current application uses some on-screen selection lists/text items, a classic report underneath that, then an extract button to run another screen (passing in the filter values) which runs the query again to extract to the external csv file based on the filter values.
I really want to change this to an interactive report, so the users can filter on anything they want to (and not have to request more filters to be added to the screen as we change the schema), then either hit an extract button or better: use the Download capability of the IR.
I have tried:
1. IR with a hidden field to collect an ID, create a collection then loop through the collection contents in a separate screen to output to csv.
problem: the rows have to be on-screen for the hidden item to have a value, so unless the users are showing All rows, I don't get the full data set in the collection (apex_application.g_f01.COUNT just equals the rows on screen)
2. IR, then use the built-in Download capabilities to output to csv.
problem: I don't want all fields downloaded. I may have 20 fields on screen, the user has applied filters to many of them, but the csv needs 3 fields. I can make the output of every field I don't want outputted, conditional on :REQUEST != CSV and leave the others I do want downloaded, unconditional, but then the filters aren't respected (I assume because the field is not available to Apex due to the condition) and I get more rows than I was expecting.
Is there a way of achieving this by using an IR? Is JavaScript the only way by accessing the current filtered query of an IR?
regards,
Malcolm.

Using APEX_APPLICATION_PAGE_IR, APEX_APPLICATION_PAGE_IR_RPT, APEX_APPLICATION_PAGE_IR_COND is the answer.

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Here you can see and download the example :
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Download link of IR, conditional field output means filters are ignored

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