That line of reasoning leads nowhere.
If you go to Delta via "NF" -- then why not the Beta NFs? If what you say is characteristic of NFs generally, then it is also of EIEs - the conflictors of the SLIs. And anything that is as valid for EIEs as for SLIs, according to your reasoning, is either not type related or counter-productive to your case.
And if applies to Delta NFs but not to Beta NFs, you haven't explained why. And in that case, there is no point to referring to the NF thing in the first place. Just say why it is a Beta and not a Delta thing. But I don't think you can - how could you even begin to argue that "psychological, interpersonal dimensions with a greater level of abstraction" is not a Beta NF thing?
That is the problem of using the clubs in socionics; they are split into opposing quadras.
I think you are mixing Si with Te.