I think we have clarified that there are three rak'ah of witr. In Fiqh al-Islam by Mufti Abdur-Rahman ibn Yusuf (which I would recommend you to buy since it has a full chapter, nicely explained, on the witr), the Mufti writes:
2. Sa'd ibn Hisham relates that: 'A'isha [radi Allahu anha] informed him that the Messenger of Allah [salla Allahu 'alayhi wa aalihi wa sallam] did not make salams in the second rak'a of witr (Sunan al-Nasa'i 1:248, Muwatta Imam Muhammad 151). (ibn Yusuf, pg. 135)
3. This narration has also been mentioned by Imam Hakim with a slight variation:
The Messenger of Allah [salla Allahu 'alayhi wa aalihi wa sallam] would not make salams in the first two rak'ats of witr (al-Mustadrak 1:304
Imam Hakim then states, "[This narration is] is authentic according to the condition of Imam Bukhari and Muslim." 'Allama Dhahabi agreed with him. (ibn Yusuf, pg. 136)
4. The following is another variation of the above narration related by Imam Hakim:
The Messenger of Allah [salla Allahu 'alayhi wa aalihi wa sallam] would perform three rak'ats of witr making salams only at the end [in the final rak'a]. This was the practice of the Leader of the Faithful 'Umar ibn al-Khattab [radi Allahu 'anhu] and it is from him that the people of Madina acquired this practice (al-Mustardrak 1:304). (ibn Yusuf, pg. 136
There were many on the Sahaba (radi Allahu 'anhum) who prayed 3 rak'ahs of witr in the manner which the Hanafi madhab tells us to pray witr. This is also Fiqh al-Islam:
3. Hasan al-Basri was informed that
'Abdullah ibn 'Umar [radi Allahu 'anhu] would make salams in the second rak'a of witr. Hasan al-Basri informed that 'Umar [radi Allahu 'anhu] was a greater jurist than [his son], and his practice was to say the takbir and stand up from the second rak'a [for the third without making salams] (al-Mustadrak 1:304). (ibn Yusuf, pg. 139)
4. Makhul reports: 'Umar ibn al-Khattab [radi Allahu 'anhu] would perform three rak'ats of witr without salams in between (Musannaf Ibn Abi Shayba 2:295). (ibn Yusuf, pg. 139)
5. 'Abdullah ibn Mas'ud [radi Allahu 'anhu] says,: The rak'ats of witr are three similar to the daytime witr prayer (i.e. Maghrib) [(Muwatta Imam Muhammad 150, Majma' al zawa'id 2:242 U)]. (ibn Yusuf, pg. 139
There are more proofs from the madhab of Imam al-Adham, Imam Abu Hanifah (rahimAllah). But here is what I thought would be relevant. We see what the Sahaba did do three rakahs of witr, and Abdullah ibn Masud (radi Allahu anhu) did witr in the same manner as Maghrib. If the Salafis want to ignore and reject this, let them. But honestly, there is no need to argue with them about it. I once sent a question to SunniPath, and someone wrote the following reply to me: "Don't argue with those who don't have true Sacred Law knowledge, Allah Most High has prohibited it." I think it would be best to adhere to this. But please do get a hold of Fiqh al-Imam, there is a lot of information on key proofs in Hanafi Fiqh, and there is one chapter dedicated to the number of rak'ah in witr.
InshaAllah, I hope this helps, and please forgive me if it didn't. And please forgive me for any mistakes that I may have made writing the post.