I don't know if there's a font family that already supports what you need, but I doubt it.
Some type foundries allow modification of their fonts, others do not. It's a matter of checking the specific license. One could also contact the foundry about making such modifications.
I would recommend hiring a professional to do the modifications. Given the costs of buying high-end font-editing software for yourself, it isn't going to cost you much more, and will get better results.
Regards,
T
Thomas Phinney
Fonts Program Mgr.
Adobe Systems