Learning Srimad Rahasytrayasaram through kalakshepam is beneficial, one can get to experience Emperuman but not undergoing this kalakshepam does not result in sin or obstacle. It is fortunate if one gets to do kalakshepam; else, we lose an opportunity.
For example, Srimad Rahasyatrayasara kalakshepam is like someone gifting us Rs. 50 lakhs; if we refuse the gift there is nothing wrong but we are a loser in refusing the gift.
So, if we do not undergo kalakshepam it is a loss, but it does not result in sin. It is our choice. It is laudable that you practice the daily austerities and recite slokas.