The_
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If it's a full random map, then only changing the colors is allowed. If you deny your opponent the right to choose a castle, then you lose the right to the red color. This is fair and has already been discussed for the M200 and Anarchy templates.
Even though it's not that important, I still can't agree.
A good example is the "one for all and all for one" tournament, where the colors don't change after subjective restarts, even though the group stage is played in two rounds.
P.S. if the intention is for a full random map, then the starting bonus can be anything, I don't mind
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