Is the 1A+D option select a viable option to get out of this setup?
It depends. C-Hisui's 5a hits high and may miss crouchers, so the shield may whiff.
Also, her 5A after the Bento setup can purposely be thrown too early to whiff. Best case is you may throw tech. Worst case, your shield comes out and you get thrown again.
Mind that after a throw tech, you will still have to worry bout the bento.