You know, these are great questions. I hope you don't believe you have the answers...because the temptation of revelation is to solve part of a mystery and then make of it a dogma...or just more papal bull, as the Romans have done.
Are there 2 kinds of imparting.
It's my guess...guess only...that there are seven. You don't ever hear of the "seven-fold father" or the "seven-fold" Jesus, but the seven-fold Spirit of God is mentioned in both the Old and the New Testaments.
The Eunuch did not receive the laying on of hands by Apostles but he was surely indwelt by the Holy Spirit.
I don't see where the Bible uses your terminology. I'm assuming you are suggesting an interpretation here. The Eunuch is clearly buttressing Paul's view expressed in Romans 2...but even then, Paul speaks without further explanation:
14 For when Gentiles, who do not have the law, by nature do what the law requires, they are a law to themselves, even though they do not have the law. 15 They show that the work of the law is written on their hearts, while their conscience also bears witness, and their conflicting thoughts accuse or even excuse them 16 on that day when, according to my gospel, God judges the secrets of men by Christ Jesus.
The Samaritans were surely indwelt by the Holy Spirit before the laying on of hands.
Again...you're fitting the narrative into your presumption, and one can argue that it fits neatly. However, do not ignore that when the Samaritans were baptized in the Spirit, something happened so pronounced, that the magician was willing to pay for the "trick" he witnessed. Bad tricks don't sell, and good tricks don't sell cheaply. Simon was willing to pay.
Apollos and his followers were surely indwelt by the Holy Spirit prior to being baptized again.
Again...Luke says Apollos knew everything perfectly concerning Jesus Christ, but he did not know anything about the baptism of Jesus, as John the Baptist described it, "with the Holy Spirit and with Fire." You can safely say, after the sower has done his work, that "the field is indwelt by the seed..." but there is something of Life that has yet to arrive.
So there is a difference between being indwelt with the Holy Spirit, and the Holy Spirit falling on you.
What do you think?
I don't think Luke's language is consistent enough to be dogmatic with any of the inadequate descriptions we use to testify to our own experience.