This is a very safe and sensible way to test one's resolve, one's skills, discover one's skill limitations, and do it all without putting oneself in danger.
I don't think there's anything wrong with bringing along most of your regular gear however, so that you don't have to leave and head indoors if you discover your fire-making, shelter-building and foraging skills are inadequate. You may find that shelter building will take too long and leave you famished and having a tent or hammock as a backup sleeping shelter would serve you well. Or you may find that all is going smoothly in those respects, but fire-building is proving harder than anticipated. A small stove and fire lighting equipment to boil water could permit you to stay out instead of packing up early. You may also want to take into consideration that working out in the bush to build fires, shelters, and forage will burn a lot more calories than you would on a typical camping trip, and if you don't find much to eat, you can find yourself getting cold unless it's very mild at night.
With respect to the use of real flint and steel, it's actually very hard to generate sparks hot enough to ignite natural tinders. It's easy with a ferro-rod, but a ferro rod is not flint and steel. So, I'd recommend you use your real flint and steel in conjunction with charred cloth. As you likely already know, charred cloth with take even a small spark and produce a growing, glowing ember that will ignite natural tinders more reliably.
Best of luck to you and hope this helps,
No one has ever been heard to say on a deathbed, "I wish I'd put in more time at the office."