So, I was watching a Doughnuts where he took the Sundergat to round 100, and he did a side ee that gave him a perk bottle that he already has, he said he wished that there's a way to make these useful by counting towards eternal perks, but I think they could push it even more with the idea of "super perks", so hear me out:
If you have an eternal perk, and you get the same perk bottle, let's say for example double tap, if you pick that bottle while you already have eternal double tap, you should activate a "super" perk, a super perk should give you a buff to one of you minor augments randomly, in our case here, maybe give you even more of a buff to your fire rate (double time).
There might need to be some exceptions to this to maintain balance, but overall I think it's a good idea to do more side easter eggs in the later rounds.