Oofta
Legend
While it feels reasonable, I'd be a little hesitant as well for the same reasons others have pointed out.
I'd allow this on a trial basis, try it for a game or two and see how well it works. If it doesn't work, the supplier goes out of business.
But, I question the basic hypothesis that a bard needs to do more damage. I know everyone has different preferences, but a bard is kind of supposed to be a support character. If they want to do more damage there are various options to achieve it.
In a previous campaign the bard multi-classed into warlock for the sole reason to get eldritch blast but I don't recall him ever using it more than a handful of times, especially after the first few levels. There were simply always better things for him to do that helped others damage the enemy or nerf them somehow.
So either give the bard another level or two and see if that helps or do a play test.
I'd allow this on a trial basis, try it for a game or two and see how well it works. If it doesn't work, the supplier goes out of business.
But, I question the basic hypothesis that a bard needs to do more damage. I know everyone has different preferences, but a bard is kind of supposed to be a support character. If they want to do more damage there are various options to achieve it.
In a previous campaign the bard multi-classed into warlock for the sole reason to get eldritch blast but I don't recall him ever using it more than a handful of times, especially after the first few levels. There were simply always better things for him to do that helped others damage the enemy or nerf them somehow.
So either give the bard another level or two and see if that helps or do a play test.