Anything not H4H is always a change. RMCTF is certainly a good one. The bigger service charities have just had a £36M cash injection from Banks fined for libor fixing, so I doubt they would be as appreciative.
Not really and unlike H4H, it helps anyone that has served, regardless of in what conflict (if applicable) and age. As good as H4H is, they only look after those that have served in Telic or Herrick and have taken the focus off the Legion and the respective Arms benevolent funds.