The King's German Legion (some of which was transferred to the Hannoverian Army in order to assist with its reformation) did indeed incorporate a lot of rifles into the Line Battalion light companies. Typically, each light company consisted of one platoon of riflemen and a second of musket-and-bayonet men, reflecting the 18th Century attitude to riflemen - namely that they needed close support from musket-armed troops in order to function safely, because of the longer loading time of the rifle. (The arming of the two KGL Light Battalions also reflected this: initially, both had been half rifle, half musket; the 1st Light Battalion had evolved into all rifles during the Peninsula War, but the 2nd had retained a 50:50 split, and even by Waterloo, was still "mixed" - though not to quite the same extent as previously.)
I'm afraid that I do not know enough about the reconstructed Hannoverian army of 1815 to say if the above organisation was common with the non-KGL line/light/landwehr battalions or not, but given that - with one or two exceptions - the units were relatively well kitted out during the Hundred Days, it is possible that at least some units had light company organisation/equipment similar to that of the KGL units described above.
I hope that helps.