aqwsed12345 : The presence of [nomina sacra] for both Christ and the Father indicates that the earliest Christian scribes viewed Christ as fully divine ...
aqwsed12345 : The use of nomina sacra for both the Father and the Son in the earliest manuscripts signals that the early Christians were expressing their belief in the shared divinity of the Father and the Son.
aqwsed12345 : these sacred abbreviations reveal a deliberate and consistent effort to honor Christ as fully divine, in the same way that God the Father is honored.
These are interesting interpretations of the use of nomina sacra, but are necessarily subjective as we have no contemporaneous record for the reason that nomina sacra were standardised. What we can say for sure is that the original writers of the gospels and letters did not use nomina sacra, but that this practice was developed later by copyists.
Colin Roberts identified three classes of words as nomina sacra: (1) 'God', 'Jesus', 'Christ' and 'Lord', whose contractions were early and fairly consistent (2) 'spirit', 'man' and 'stauros', which are contracted relatively early and frequently, and (3) 'father', 'son', 'saviour', 'mother', 'heaven', 'Israel', 'David', and 'Jerusalem', which are contracted irregularly or inconsistently.
If the use of nomina sacra indicated "shared divinity" of "full divinity", it is difficult to explain why it was also used of 'mother', 'Israel' or 'Jerusalem' unless they were also thought to share in "full divinity". Further, your suggestion that nomina sacra were only generalised in later mansuscripts is not altogether correct.
As early as the second half of the second century, wholesale contraction of 'lord', 'spirit' and 'father' occurred, both sacred and mundane. In papyrus P66 (c. 200) every occurrence of 'lord' is contracted, and most occurrences of 'father' including reference to the devil (John 8:44). In papyrus P75 (third century) every occurrence of 'spirit' is contracted, including unclean spirits (e.g. Luke 4:36; 6:18; 8:29; 9:39,42; 10:20; 11:24,26).
You may be right that some understood the use of nomina sacra for 'Jesus' and 'Lord' (when it referred to Jesus) to give him a similar reverence as that given to God. And likely those who accepted the trinitarian doctrine in later years understood it in a similar way that you do. But the widespread use of nomina sacra beyond 'God' and 'Jesus' suggests that you are reading more into it than the early scribes intended.