Linux Script - Find, Copy, Paste and Change Text Files

Question

I have these 3 files:
Access.txt: Large text file with row records and columns separated by " ; ".
NewAcess.txt: List of new accesses to add.
NewUsers.txt: List of new users to add.

File Example:

Access.txt:

(rec;john;file.txt;test.arquivo.050)
(rec;Mike;file.txt;test.arquivo.010)
(snd;mary;testaaa.txt;sendt.asdttvo.100)
(rec;john;Notepad.txt;new.testetto.002)

NewAccess.txt:

(test.arquivo.010)
(sendt.asdttvo.100)

NewUsers.txt:

(Suzy;john)

I need help creating a script that does the following actions:

1. Create a backup of the archive Access.txt.
2. Search the archive Access.txt each of the file values NewAccess.txt (ex: test.arquivo.010) and copy the line referring to the first match of each criterion (from the file NewAccess.txt) for a new line and replace in the new line the user name field with each of the names in NewUsers.txt.

Desired Final Result:

Access.txt:

(rec;john;file.txt;test.arquivo.050)
(rec;Mike;file.txt;test.arquivo.010)
(snd;mary;testaaa.txt;sendt.asdttvo.100)
(rec;john;Notepad.txt;new.testetto.002)
(rec;Suzy;file.txt;test.arquivo.010)
(snd;Suzy;testaaa.txt;sendt.asdttvo.100)
(rec;john;.txt file;test.arquivo.010)
(snd;john;testaaa.txt;sendt.asdttvo.100)

I’m thinking of separating in the following steps:
Find the corresponding lines and copy them to another file Access_temp.txt.
Change the second column (from 5º char) of the new file Access_temp.txt with the name of the new users.
Paste the contents of the file Access_temp.txt (overwritten user) to the file Access.txt.

I started trying with the following command:

grep -Fwf NewAccess.txt Access.txt > Access_temp.txt

But I need you to grep just bring me the first result of each file criteria NewAcess.txt, but I don’t know how to do it.

I really need help putting this one together script, don’t know scripts in Linux.

Thank you very much!