That’s definitely a stay at home mom hack if you ask me. Even if you only send them to Daycare part time.
You are not. SAHM it's not a vacation, you are not on the couch watching TV all day (that would be great right?) but it's not, you basically work without being paid. As your partner has his recreational moments you must need one as well. Talk to him and find a compromise that works. If he doesn't want to help you on keeping the kids couple of hours during the week so that you can go out or do whatever you like to recharge, let him pay for daycare or a babysitter or whatever suits you best.
Is Daycare an option? That way you can get some alone time during the week