If we are talking about such number of symbols, I think you should think about particle system. Use single quad array for all labels, on each viewplatform move aligning it perpendicular to view. You have two choices here - either change size of each quad depending on distance from viewer (thus having constant size in screen coordinates), or stick to one size, thus having more distance labels smaller. This single geometry would use one texture with digits printed on it, you will probably want to compose numbers from sigle digits.
Of course, there are some other problems with this approach - you need to update labels' positions yourself (they cannot just attach them to TG), you need to decide what you want to do with partially visible labels etc.
Artur
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