If you can afford to work part time (because your dh earns enough to enable it and he's happy to do so) then that's fine.
Just a couple of thoughts though...
You mention the thought of doing your job full time fill you with dread, and that it's a job of convenience. I think you're setting the bar very low for yourself if that's the attitude you have towards your job. Work is a big, necessary part of life- surely you should aim for something more fulfilling?
Secondly, you mention that you need to work part time to fit in all the domestic chores. No, you don't. It's quite possible for a couple to work full time and split home stuff equally. Most domestic chores expand to fit the time available... if you have 2 days a week you'll easily fill them, but you'd manage ok regardless
As a general point (and this is not a criticism, just an observation) you mention having been a SAHM for a long time, and it seems often when women have been in this situation they plump for a part time 'convenient' job once the kids are a bit older, and continue to do well over half the domestic chores. It's a bigger adjustment for you as a couple than if you'd both continued to work and hadn't had several years at home.
Ultimately it's a decision for you and your dh alone- but in your position I'd be weighing up a few issues: is your dh content with his work life balance? Are you really happy in this job? Do you really want to spend 2 days doing domestic chores? Would
You prefer a more fulfilling job where you could afford to pay someone else to be doing the housework? What are your long term goals, bearing in mind a working life nowadays extends to around age 67?
(Sorry that sounds like the inquisition! - just trying to give pointers to consider!)