Sightstone and the T2 warding totems

I feel it's worth pointing out that sightstone doesn't gain charges the way the t2 warding totem does, and so in some ways it falls off later in the game. However, at the same time it does have the perk of holding more wards at maximum capacity. What can Rito do to make this stay balanced while making it feel more rewarding later in the game?

I have a few ideas, let me know what you think. At the moment I'm confident that they would probably need some serious tweaking, so please bear with me.

1: After level 9, it gains charges the way the warding totem does. 2: After level 9, it increases the number of wards you can have on the map from 3 to 4. 3: After level 9, its maximum number of wards increases by 1 (to 5 for basic, and 6 for ruby). 4: After level 9, you can cast a ward on another, and it will turn it into a pink ward. 5: After level 9, any vision granted by multiple wards will gran true vision (sort of like a venn diagram- the center section would be true vision). 6: Change the item path so instead of making ruby sightstone you can enchant the sightstone, sort of like jungle items (thanks to TheHobbits). 7: Have any of ideas 1-5 but instead of at level 9, have them apply to only ruby sightstone (thanks to AtrocityEyes).

Ideas, questions, suggestions? Leave a comment. Stay beautiful and don't set fire to anything I wouldn't. Thank you.

Edit history: 3-11-'15 3:42 US Central: added 6 and 7 courtesy of AtrocityEyes and TheHobbits