If you want to go for a more relaxed approach you can go for 20 or 21 pop up to feudal just as you do with a regular scouts BO (it’s pretty much identical apart from you try to go for only one lumber camp and of course you don’t build a barracks while upping so 7 on wood is sufficient). However, it’s fairly tight and doesn’t work without dear. This way you will get the maximum amount of extra vills in feudal. When you reach feudal you build the tc and get bit axe and horse collar immediately. After clicking up you send most of your vills under the tc to wood (you need at least 8 on wood, here). If you do not expect early aggression from your opponent and you are able to push all your deer you can aim for a super early 18 pop up with 2 vills on wood. Imo it depends on how many extra vills you want to have until going to castle age. There might be BOs for setting you up until feudal age, though. Since you have a lot of villagers in feudal age, a BO for going castle age wouldn’t make too much sense.
