As far as notifying debenture holders is concerned I know from experience It would be an impossible job. Some debentures have been held for many years and the holders may either be dead or at a different address. According to the Articles debenture holders should be notified in writing and a copy of the accounts attached to the notice.
The directors merely have an obligation to write to the registered debenture holders at their registered address, including full details of the resolutions (which would include the new articles), proper notice and the procedure for voting by proxy.
Which seems very reasonable to me.
It's the debenture holder's responsibility to notify the club of changes of address. If they die, then it's up to their personal representatives to notify the club of that. Somebody owns that dead person's debenture. It doesn't just disappear.