Personas 2.0: How to run a tcode from inside another tcode?

Hi Personas 2.0 experts,

Use case:

run ME51N > land to a screen. Here I want to get user's inital by running su3. Is it possible to do here? I know I can first run su03, then pass the initial to ME51N, but that way is not what I want. Just want to know if one can run a tcode while running another tcode.

Thanks.

Dong Zhu