RTF is a global modification that replaces all towns in the game.

Could you please share a link to the level 2 Naga, Sea Elf, and if available, a Sea Elf Warrior.

Added 2 minutes later
No one has responded to the mod requests yet, and it's been about 3 weeks.

No
no one answered you because no one wants to mess around in the Sanctuary.

By the way, there's only one Sea Elf; Zakhar ported it from the seventh game.

Tier 2 is probably Kappa, also Zakhar's units.

Added 40 minutes later
I mean, they have NCF versions, so dig around in them. In principle, you can just delete the files with the characteristics of unnecessary units, and that's it.