Basically, the choice between temperate and tropical species comes down to the colder weather and how you are able to accommodate for your tortoise.
With temperate species you have to be ready to brumate if you want to keep your tortoise mainly outdoors...
Any temperate species would probably work for you.
Info for your research:
https://tortoiseforum.org/threads/info-for-new-people-please-read-this-first.202363/
Info on temperate species:
https://tortoiseforum.org/threads/the-best-way-to-raise-any-temperate-species-of-tortoise.183131/
I believe that it is a plantain of some sort (though I am not sure from the picture), maybe broadleaf plantain (Plantago major). All plantagos are safe https://www.thetortoisetable.org.uk/plant-database/viewplants/?plant=208
I would recommend you give your tortoise a soak in warm water every day while he is sick to avoid dehydration as he is losing fluids from his body. Is he eating fine? Does he respond if you touch his feet?
I am no expert in manouria emys, so I can't advice on the percent.
Beans can't be fed raw as they contain a toxic compound that disolves in high heat (https://www.thetortoisetable.org.uk/plant-database/viewplants/?plant=494&c=8).
Tomatoes and peppers are so high in sugar that in a tortoises...
These threads are recommended for all new keepers to read:
https://tortoiseforum.org/threads/info-for-new-people-please-read-this-first.202363/
https://tortoiseforum.org/threads/the-best-way-to-raise-any-temperate-species-of-tortoise.183131/
For tortoises that young (if he is in fact 6 months...
The tortoise table is a bit overly cautios about his plant in my opnion. Prickly lettuce does produce latex containing oxalic acid but in my opnion it can be fed as a part of a varied diet. (See this thread https://tortoiseforum.org/threads/can-anyone-id-these-weeds.70296/ message #6).
Leave the play sand and moss out they are both impaction risks and the sand can irritate the turtle. I unfortunately can't really advice on what you should do with your turtle, since I don't know your area...