The idea of an "intensifier" is interesting. That makes it almost an appositive. And yet, "myself" would require the verb to change its inflection by adding an "-s".
But then, "myself" would not really modify "I". What kind of I? -- myself I. That doesn't really work.
This may be a situation where Reed-Kellogg comes up short.
Tell me what you -- or the other authorities that you know -- think.
Perhaps I did not explain myself well. She just said that
for one is an
intensifier like myself.
I, for one, like X.
I myself like X.
Yes, the books say that
myself is in apposition with
I. So some
people make the case that
for one is in apposition with
I. Sounds like
a good idea. But your idea is great, too.
For one is a prepositional
phrase. In fact, she told me that
for one is something like
for example.
You parse it as modifying
I. Appositive or modifier -- it doesn't matter.
She agrees that it refers to
I. For R-K, we could diagram it your way, or
I guess we could do it this way (please forgive my crude description):
We could diagram
for one in the way we always diagram a prep. phrase.
Then we could fit that diagram in the parentheses to indicate an
appositive: I ( ) like X.
Another way: I ( one ) like X. Above
one, we could draw a line
and on that line write the word
for. That is, we could call
for an expletive
introducing
one.
Personally, I think that your idea is the simplest and best.
P. S. Some dictionaries even call
for one an adverb!!! But they do not
explain what it modifies.
I suspect that of the 7,000,000,000 people on earth, most (99.99%)
could not care less!!!