Idea:
Give the ability to trade the cosmetic account-bound infusions for respective basic account-bound infusion versions. Examples:
One of the vendors in Fractals/Mistlock Sanctuary allows the player to convert Fractal-relevant infusions
Abyssal Infusion with +Condition Damage > Malign +9 Agony Infusion
Celestial Infusion (Red) with +Power > Mighty +9 Agony Infusion
Mote of Darkness with +Precision > Precise +9 Agony Infusion
Etc.
One of the vendors in Eye of the North allows you to trade Deldrimor Stoneskin Infusions
The Bauble Infusions at SAB Vendors
However, I'd suggest making the Bauble Infusions purchasable from the SAB vendors for a deal that is carefully considered, relative to the other +9 Agony Infusions in the game; obviously locking the ability to purchase them behind the related collection achievements.
This change will not impact most negatively, and will allow players to utilize earned infusions that would otherwise impact an appearance negatively.
There are some players out there that would be affected by the ability to purchase extra Bauble Infusions, by having the achievement of having more than 3 Bauble Infusions rendered pointless.
However, the ability to obtain more than 3 infusions is if the players abused the Support System to get otherwise unobtainable amounts of Bauble Infusions.
This concludes my suggestion, thank you for reading.