I want to send some creatures and items to my other account.

With stealth. Unfortunately, the skill level is too high for you to master and you will be caught.

The reason the transfer of creatures, items, resources etc from one account of yours to another (from main account to alternative account or the other way around) is forbidden is the two accounts are not related. Sure, the person behind them is the same, but in the realm they are as distinct as sky and earth. They may be fractions of yourself, but these fractions cannot trade with each other - even if they become best buddies in the realm (the equivalent of you saying that you yourself are awesome, so you should hang out with yourself). It kinda makes sense, no?

So don't do it, even if you're so inclined, for punishment awaits with big nasty pointy teeth! (warning, jailing, ban)

Any attempt of intentionally transferring items and creatures between accounts you own are illegal, and will result in punishment for all accounts involved - including those who helped you bypass existing methods to prevent alt abuse.