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Tool to Modify a .FIT file for "Race an Activity"?

Crowd-sourcing a solution here - I am looking to modify a previous activity to set target pace zones for and upcoming century ride.  I have a file from last year's ride, but want to set more aggressive pace targets for this year.  I know a Virtual Partner would give me an overall metric on pace target, but I would like to be able to set specific pace targets for the different sections of the ride.

It seems like this would be super easy if I had a .FIT file with the appropriate pace, but how can I take the file from last year and modify the pacing throughout to get them where I want them?  Fit File Repair Tool looked promising, but I tried running it and seemed to have some program issues.  I will try on another PC if someone can verify that the functionality should let me do what I am looking to do here.

Thanks in advance for any help!