That is really tough in this day and age. There are few multitrack tape machines left in good working order. Maintaining them is a dying art. There is only one source of tape, and it is very expensive.
Next you need the analog mixer, to mix down to two track, and then a two track recorder in good condition. You need another good tape machine at the production plant. You also need someone skilled in rocking tapes over the playback head, and can make accurate pencil marks, and be skilled at razor blade editing.
There are a lot of old time skills and vintage equipment required here.
I could make a two channel analog recording, edit it and make a copy it could be mastered from. I did it many times in years past, and still have serviceable equipment.
Do I want to do it again, not really. I'm 75, when my generation are dead, which won't be long, you will be totally out of luck.