Even if a UAS attempted to become a DTO, it would need to deliver a recognised Part-FCL LAPL or PPL course in accordance with a CAA-validated training manual.
The idea is rather a non-starter.
If there's someone prepared to make the effort, try investigating the possibility of the CAA adopting a 'modular LAPL' course under Regulation (EU) 2019/430, tailored to UAS flying training.