Add-on Add-On to Append String to Inbound RSS Feed Links

[WearableTechForums.com]

I would like an add-on to append a tracking string to inbound RSS feed links (feeds from my forums), so that I can track which referrals are from my RSS feeds. I would like the string to change based on the forum/feed. Something like this:

{link}?utm_source=rss&utm_medium=rss&utm_campaign=news.01
{link}?utm_source=rss&utm_medium=rss&utm_campaign=smartwatches.02
{link}?utm_source=rss&utm_medium=rss&utm_campaign=activity-fitness-trackers.03

I will only commission this add-on if the price is low. Please bid below only. Thank you.