I`v Very recently decided to take the "lazy" path, up until now I`v been strategic DCAing, waiting for dips and buying, and it was fun for a couple of years, but now I`v just set up a regular Buy-order twice a month so I can pretty much just ignore it from now on, and only buy extra during dips if I feel like it.
I`m in it for a good 10 years from now anyway, so may as well just set-and-forget really, the thought of watching charts for the next 10 years really doesn`t appeal to me.
The really neat part was that I had an auto-buy last night and it was during the dip! I`d have had to stay awake all night to have caught it.
Your strategy seems great and feasible but if I understand you correctly, you will be buying in a centralized exchange and in this case, you cannot set and forget because doing that will me you will be holding your Bitcoin there. It is not safe to store your Bitcoin in centralized exchanges so even if you want to use limit orders to purchase your Bitcoin, you might need to login to withdraw it to a private wallet that you have the private keys. You might decide to check ones in a month to see if your orders have been filled or not for the DCA part, you might also need to buy using market execution and withdraw monthly to your private wallet. By the way, since you have a 10years plan, why not consider using a hardware wallet to store your coins? That is safer than wallets that are connected online.
I have been storing mine off the exchange, but I`m buying small amounts regularly, so when it builds up above a certain amount I`ll be taking it off, I want just to minimise UTXOs.