Regarding: "...and if a deacon is available, (pre-consecrated) Eucharist can be distributed"
- To be helpful: any person who is authorized by the bishop or necessity can lead a Liturgical service (liturgy of the Word, and distribution of communion)  which includes distribution of the Eucharist (hosts held in reservation).  If a community is fortunate to include a deacon, then it is expected that the deacon would lead such a service.