There are various definitions for Paa Renchan, but most commonly you specifically need to win eight hands in a row and - despite the name - Renchan from dealer Tenpai draws don't count. Some definitions require all eight wins as east, but the common one lets you count earlier wins as a non-dealer (before you take dealership during your win streak).
A few too many dealer Mangan Ron wins could easily end the match, also playing with the two-Han minimum rule would be a hindrance to using cheap wins once the Honba counter is wound up. Perhaps the biggest barrier would be that this optional rule is not widely adopted, although it's a relatively common feature in video-games.
Most prominently it's included in the
Mahjong Fight Club games - I found a (noisy) video of someone getting it.
https://www.youtube.com/watch?v=fGUjEUxmLyM
It only shows the final win though - it happened to be a double Ron.
(The opponent scores are still fairly high there because they were playing with 30k starts.)