I agree 100% with this. Ill also be the 4th or 5th person to say getting a type 6 cow tag in one of the general areas you are looking to hunt would be an ideal way to get you and your son exposure to DIY elk hunting while still banking those points to be able to guarantee a general bull tag/any elk tag in an area you have experience in once you have it figured out. You may find out your son doesn't enjoy/isn't ready to hike 2 miles uphill in the dark to get to where the elk are, and that is good info to have prior to feeling like you HAVE to still hunt because you've got 6 years of points tied into a tag.
My kids are younger than yours (6&8), but that's what ive been doing with pronghorn tags until they are old enough to start that same process with elk. We get doe tags or easy to draw unit 700 tags and then get to go at the pace and enjoyment of my kids. Don't want to wakeup while its still dark and you'd rather go eat breakfast at a diner instead of eating out of the cooler? SURE! I want this to be just as enjoyable for you as it is for me and if im stressing about a tag I spent 10 years of points on, I know that's going to spill over into how I 'push' my kids to be able to fill my tag with the best buck, bull, etc. possible instead of the one "they pick".