A few years ago some US based primitive tech people tried living for 2 months totally stone age (the Kootenai River Project, led by Lynx Vilden). One of the things they noticed was that modern "bushy" people are very knife-focussed, and that there was an interesting change in mind-set when the metal knife was no longer available.
I've been out without a knife as well (but only for 10 days), and it *is* a change in perspective. We are so used to "just cut some poles" (etc), so being limited in cutting (no flint where I was; a shard from an old beer bottle and some smashed granite bits was the best we had) was a quite an eye-opener. Break, bend, tear, adapt, subsitute. Abrade things with sharp rocks (can you make a bowdrill set with no metal tools? it is possible and a damn usefull skil...), work around the problem, etc.
* Make a bowl, kuksa and spoon by abrading a found chunk of wood with "random" rocks and then coal-burn the hollow bits.
* Cook your dinner without any brought tools or implements.
* Make a shelter.
* Weave a cattail sunvisor.
* Make a basket or bark container and fill it with edibles.
* Do some simple pottery.
* Braintan a deerhide.
* Make a simple carrying basket from some willow and spruce roots. Use it as a pack to the moot.
* Work bone.
* Make a fat lamp from a piece of limestone.
* Make a celt or a grooved axe.
* Make a simple bow and arrow set, and practice until you could kill a small animal.
* How are you on traps?
* With the throwing stick? The sling?
* Buy a couple of Goodwill furcoats, cut into strips and try to make a faked "rabbit robe".
If you do without a knife for four more years you could be a source of envy at the bushmoots. Imagine turning up at the moot with a home-made packbasket, sleeping in a "rabbit robe" and cooking your food in a pit, making no-tools bowdrill fires, etc. With a deer-rib knife at your belt, in an Ötzi style sheet.