[FT]Custom Heroes and Tiers

For my new races map I am making some custom heroes. With a trigger I was able to prevent the training of more than one for each type of heroes, but custom heroes don't count for the tiers requirement. If the first heros trained is a normal heros then the custom heros needs the appropriate tiers, but if the first heros trained is a custom heros, then we still can train another one without the appropriate tiers. Can someone help me please?

Ok, i found a way to solve the problem. Just put your custom heroes into the line "dependency requirements" of a normal hero from the same tech tree than your custom heroes.
But that doesn't help me much since for my new races I use custom halls which don't count as normal one As a result if I do what I just explained, I will not be able to trained a second or three heros because the game will consider that I don't have a tiers2 or tiers3 Hall.
So my new question is: how to make the game considers that my custom halls are normal one?