As a player of a game that runs since over a decade, the answer would surprise you:
Renown is exemplary deeds - you don't gain it every day
Sure, Renown is nice and unlocks the next rank with new toys, but in essence, not every evening contains things that shall award renown. There are game days when the players sit down and describe their PCs learning new rites or gifts. There are sessions when the PCs do the boring legwork that leads them to the BSD Hive or Pentex Lab. Those sessions don't carry renown rewards. As such, the lowest Renown is 0.
Temporary Renown is capped at 10
And then there are combat rounds when the actual attack on the Wyrm happens. Those actions reward Renown. Those sessions get compared to the appicable renown charts, and could lead to 10 temporary renown per type. Then you absolutly need to to the Rite of Accomplishment and any more renown in that type is only counted once you have turned 10 temporary to 1 permanent renown with the rite.
Sure, you might just have ticked the boxes for 18 points or temporary Glory... but you only can bank 10, anything more goes poof unless the GM oks you to keep the extra ones for they handle the Rites of Accomplishment more loosely.
Screw tracking, make it Storytelling!
There is another way that worked for our group when there was a dry spell of forgotten tracking: Make the renown application a task for the Moots. Award the renown in a mix of temporary and permanent points at the moot matching to how they tell their story. Assume they have rites of Accomplishment running.
Do they put emphasis on the raw fury or the wisdom of their actions? Reward accordingly.