you do have another option. the are accounting and law firms in your country which have expertise in taxation between the two countries. can't say what the cost would be
and a DL might not be correct thing to file
from
https://www.irs.gov/irb/2021-01_IRB
.03 A “determination letter” is a written determination issued by a Director that applies the principles and precedents previously announced by the Service to a specific set of facts. It is issued only when a determination can be made based on clearly established rules in a statute, a tax treaty, the regulations, a conclusion in a revenue ruling, or an opinion or court decision that represents the position of the Service.
