I have about two dozen or more of them, which I made myself from bare shafts.
I enlarged the ID for a thin wooden rod to be glued in.
You have to ge very careful with drill bits here, I did 1/10mm increments and drilled slowly.
Otherwise, it will split lengthwise.
I had used 3mm or 4mm OD beechwood rods, and the water-resistant kind of elmer's glue.
Then, you can just take the "usual" sharpener tool for nock an tip, and glue on both.
I did a few self-nocks, but that was a pain in the behind, to be frank ...
And a few additional comments ...
Bamboo shafts are most often sorted for spine.
Which means, both weight and outer diameters will be different.
For instance, you might use a 5/16" tool for some, and a 11/32" for some others.
A few suppliers (at least here in Europe) offer shafts sorted by spine and by weight - which of course costs extra.
For the spine-sorted shafts, +-25gn is normal, and +-50gn is not unusual.
On the upside, they are very robust, and have a natural taper and thus an inherent positive FOC.
Which means, you get away with relatively light tips.