[joaquimandrade]

That code you posted is too much for a so little thing.
What I would do would be:

Register all them in the spawn and disable them afterwards and enable them where I would do the normal Register.

Or if you want to have it more normal, create a module that creates a bot with server commands before plugin loading, gets the virtual table of the bot, creates a imitation of in instance of a CSSBot class just with the virtual table pointer in the same place, and provide a native to plugins to get the address of that imitation like get_fake_bot().
Then you would do RegisterHamFromEntity(get_fake_bot(),...) (Anywhere)

Like:

When you create a bot you will have a CCSBot object.
Get that object address hooking its spawn or whatever.
Get that object virtual table pointer.
Create a dummy object and set its virtual table pointer to point to the virtual table of the bot.
Now you will have a permanent dummy object for the rest of the server that will never be destroyed and can be used the same with RegisterHamFromEntity as if it were a bot.

That's the best I can think of.