For the “Reception of Baptized Christians Into the Full Communion of the Catholic Church” the rubric is:
“If the person being received has not yet received the sacrament of confirmation, the celebrant lays hands on the candidate’s head and begins the rite of confirmation with the following prayer.”
The original numbering for this is R17. In the Rite of Christian Initiation of Adults book for Australia (approved in 1986) it is number 406.
Appendix 1 in this book is “Celebration at the Easter Vigil of the Sacraments of Initiation and of the Rite of Reception into the Full Communion of the Catholic Church”. It includes:
“418 Pastoral considerations suggest that along with the celebration of the sacraments of Christian initiation the Easter Vigil should include the rite of reception of already baptised Christians into the full communion of the Catholic Church. …”
“419 Inclusion at the Easter Vigil of the rite of reception into full communion may also be opportune liturgically, especially when the candidates have undergone a lengthy period of spiritual formation coinciding with Lent.”
You’re doing cut-and-paste of sentence clauses taken entirely out of their broader context.
The Easter Vigil is not the proper time for receiving the already baptised. Obviously, the Easter Vigil is designed to welcome those not yet baptised. The prayers speak very clearly of that. There is not one word in the Easter Vigil Mass that speaks about welcoming the already-baptised. It’s ordered entirely toward baptism (unless, of course, the optional form of “when there is no baptism” is being used).
For practical reasons, in many places, the catechumens and candidates are often grouped together. This is a practical solution, and I don’t fault anyone for using it. However, all of the Lenten RCIA ritual through (and including) the Vigil the prayers are entirely about the un-baptised.
The only way to achieve combining the two groups is to combine the 2 different ritual tracks in a way that they were never intended to be combined.
The Easter Vigil Mass says nothing about the already-baptised being received into the Church. Read the Roman Missal. There is nothing there; not one word.
The Easter Vigil Mass must be modified in order to accommodate receiving the baptised.
Again, this is common practice. As I wrote earlier, it is probably the most common practice. **However it is not the way that the 2 forms of RCIA were ever intended to be employed. **