Okay I am okay with that with the following caveat in order to keep it from being abused so-to-speak. Further the version of Bardic Inspiration you have must be chosen then but can be augmented as you gain levels.
Bardic Inspiration
The Bard can inspire others through stirring words or music. To do so, they must make a performance check DC of 10 on their Turn and choose another creature other than themselves within 60 feet of them who can hear them. That creature gains one Bardic Inspiration die (d6). Once within the next 10 minutes, the creature can use that Bardic Inspiration die. A creature can only have 1 Bardic Inspiration Die. The Bard can use this feature a number of times equal to their Charisma modifier (minimum of 1). They regain 1 Bardic Inspiration when finishing a Short Rest. At first level the Bard gets Mundane Inspiration and when they gain a new level they make keep that or swap it for a different type of Inspiration. At higher levels the Bard can choose additional Inspirations. The die and the number of Inspirations a Bard has are as follows: 5th level d8 and 2 Inspirations, 10th level d10 and 3 Inspirations, and 15th level d12 and 4 Inspirations.
Mundane Inspiration
1st-Level Bardic Inspiration
If a creature has a Bardic Inspiration die they can roll that die and add the number rolled to one ability check, attack roll, or saving throw they make. The creature can wait until after if rolls but before the results are known before deciding to to use the Bardic Inspiration die.
Magical Inspiration
3rd-Level Bardic Inspiration
If a creature has a Bardic Inspiration die and casts a spell that restores hit points or deals damage, the creature can roll that die and apply it to the target affected by the spell. They add the number rolled as a bonus to the hit points regained or the damage dealt up to a maximum of 50% of the original healing or damage done. The Bardic Inspiration die is then lost. The creature can wait until after if rolls the healing or damage but before the results are known before deciding to to use the Bardic Inspiration die.
Inspirational Action
5th-Level Bardic Inspiration
If a creature has a Bardic Inspiration die the can expend that Die to gain a Bonus Action that Turn. Only one Bonus Action can be used in a Turn. Further this Bonus Action can only be used to Attack (one weapon attack only), Dash, Disengage, Hide, Use an Object, or Cast a Cantrip.
Restful Inspiration
7th-Level Bardic Inspiration
The Bard can infuse their Song of Rest with Inspiration anyone receiving the benefits of the Song of Rest may also apply the Bards Bardic Inspiration die to that roll or they can use it to end the affliction of one condition the condition can be one disease, one poison, blinded, deafened, or paralyzed. This does not grant the subject(s) a normal Inspiration Die but it does consume one of the Bard's Inspirations.
Does that sound fair to you?