With all due respect, Father, the local ordinary does not have the right to overrule what is written in RS. Granted, he is the chief liturgist for his diocese; however, he cannot go against what an authoritative document of the Church says.
Which part of RS are you implying that the bishop would be going against? It has:
“[166.] Likewise, especially if Holy Communion is distributed during such celebrations, the
diocesan Bishop, to whose exclusive competence this matter pertains, must not easily grant
permission for such celebrations to be held on weekdays, especially in places where it was
possible or would be possible to have the celebration of Mass on the preceding or the
following Sunday.”
You seem to interpret “must not easily grant permission” as “must never grant permission”.
It has: “[88.] The faithful should normally receive sacramental Communion of the Eucharist during
Mass itself, at the moment laid down by the rite of celebration, that is to say, just after the
Priest celebrant’s Communion.”
It says “normally” not “only”.
It has: “[91.] In distributing Holy Communion it is to be remembered that “sacred ministers may not
deny the sacraments to those who seek them in a reasonable manner, are rightly disposed,
and are not prohibited by law from receiving them”.[177] Hence any baptized Catholic who
is not prevented by law must be admitted to Holy Communion. Therefore, it is not licit to
deny Holy Communion to any of Christ’s faithful solely on the grounds, for example, that
the person wishes to receive the Eucharist kneeling or standing.”
The bishop has to make the assessment of whether to deny communion to those wanting it at a weekday communion service. And while he must not “easily grant permission” for Communion then, it is a complicated decision he makes.