1- It is not permitted. 2- It is like the previous issue. 3- Yes, you can ask all religious lawful matters from Allah.
Travelers have the right to perform their prayers in al-Masjid al-Harām and al-Masjid al-Nabawi and also all of Mecca and Medina complete or shortened and complete prayer is better and there is no difference between old and new parts of Mecca and Medina.
The distance between the last house of the departure city and the first house of the destination city should be considered as the distance for prayer to be shortened.
Your going out of your house to the work place and then going to sail from there until reaching the destination are all consider as one travel.
If other people consider you just then there is no problem for you to be Imam of congregation.
Perform the number of prayers that you are certain you have missed with the intention of obligatory qaḍā and if you want to perform more than that, perform them with the intention of precautionary qaḍā.
Such fears and doubts are the insinuations of Satan. Don’t pay attention to that and attend the congregational prayer continuously.
Your prayers and fasting should be performed complete in both places.
This person can perform qunūt after rukū‘ and then go for sajdah without rukū‘ and continue the prayer.
They can perform the prayers simultaneously.
This act is makrūh (abominable) unless this is the only way of having presence of the heart (full concentration).
There is no issue with doing this, but if that person doesn’t join the congregation before rukū‘ of the first rak‘at then his/her right is voided.