Ezekiel 47 says otherwise. Children of convert parents can't inherit land from their parents if they don't already own it. The issue with their children being considered natural born is that they won't have to convert like their parents did. It will be as if their parents are natural born, which by law they are.
Eze 47:23
And it shall come to pass, that in what tribe the stranger sojourneth, there shall ye give him his inheritance, saith the Lord GOD.
The problem with your point here, which is true, is that you teach it in context of the error, that converting non Jews 'become' natural Jews of a tribe. Only children born of an Israelite Jew can be a natural born Israelite Jew. The same in any race, and people, and nation on earth. There is no 'spiritual' changing of one's natural genealogy.
The law has always allowed for 'immigrants' to convert and intermarry with Israelites, so that their children are natural born Israelites. But the immigrant converts remain natural born of the nation they come from. Ruth remained a Moabitess in Scripture:
Rth 4:10
Moreover Ruth the Moabitess, the wife of Mahlon, have I purchased to be my wife, to raise up the name of the dead upon his inheritance, that the name of the dead be not cut off from among his brethren, and from the gate of his place: ye are witnesses this day.
But gave birth to natural Israelites by Boaz, of whom would be born David.
Your effort to teach other nations 'becoming' natural Israeli Jews by conversion alone, is false.
However, your argument from Ezek 47 is spot on. It's not the same as the OT law, where only natural Israeli's could inherit land promised by God. Even fellow Israelites that buy their neighbor's land, had to return it to the original family inheritance at Jubilee, and not keep it as their own family inheritance.
But, in Ezek 47 when the King Himself gives the land promised to Abraham and his natural seed, they will not expel the previous owners of land.
Unlike the children of Israel out of Egypt, commanded to drive out the previous owners of the land, the remnant natural children of Israel at the Lord's return, will inherit the land with the previous owners keeping whatever land, that is now within a natural tribe's inheritance.
Unlike in the OT, the returning Lord and King will not expel and replace any previous owners, that remain alive in the promised Millennial land of Israel: Which will be from the river Nile along the Sea Coast to Euphrates.
Your 'spiritualized conversion' from one natural genealogy to another, is false. Your point about strangers remaining with inheritance among the natural tribes of Israeli Jews, is good news to those previous land owners. And new news to me. Thanks much.