Your magnum opus needs some work
I will start in the same order as the features appear.
Roundel of Inspiration
At first I thought this was difficult to parse, but as I started writing this answer I realised just how powerful this is. Bardic Inspiration dice eventually refresh on a short rest, and since you will have 5 and an average combat lasts 3 rounds ...
Not in my opinion
Bardic inspiration, unless you are taking multiple levels of Bard, will only ever be up to 5 times per long rest, that is less than once per fight if you have the intended number each day, and even less if you also use them out of combat.
So this option won't give you something to do every combat, if that is your requirement.
Bards can pick any spell
The Bard has a feature called Magical Secrets:
By 10th level, you have plundered magical knowledge from a wide spectrum of disciplines. Choose two spells from any classes, including this one. A spell you choose must be of a level you can cast, as shown on the Bard table, or a cantrip.
The chosen spells count as bard spells for you ...