Not everyone has spoken yet :)
Regarding the restructuring on Hero League (HL), I think it can be added to 8mm6a and 8hm8a, where there are few secondary objectives and not all allow for placing a Grand Mage 5 (GM5). In my opinion, on Spider, 8hm12a, or 6lm10a, there are enough secondary objectives where you can build guilds, and the question of restructuring on these templates is only about strategy (building one guild in the most remote part of the map is much more advantageous and safer than giving it to the opponent). After all, building a GM in a village in the center of the map is risky.
Regarding the restructuring itself, I would vote "for" the option proposed by Scorpio in the form of an option (checkbox). Build the GM to the maximum level - you can restructure it from level 1, and the spells will appear with a set probability (i.e., those that have already appeared may also appear). And in this case, you also need to decide on the use of level 4-5 scrolls (they can be used if you break the GM5 and start building it again).

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