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In my opinion, this option is unnecessary. The Tower is one of the weakest castles, and this change deprives it of almost its only advantage. I think a reasonable (and even then, only conditionally) solution would be to prohibit rebuilding the Library in other towns, except for the player's home town.
The issue here isn't so much about the starting Tower, as I understand it. Strong players always try to build a Guildhall in the Tower (either in their own town or in a captured town) at the expense of the Library. Rebuilding the Library in addition to rebuilding the Guildhall gives an advantage that is too great, which is what many strong players dislike.
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