quercus

I suggest you read the thread/poll about pruning with or without the use of spurs.
A lot of info can be found there. Although I haven't got much experience with palms, like some others here, it seems as though the technique that's being used strongly varies according to the type of palm.It also appears to be a dangerous tree because of large and heavy fronds whom can suddenly fall down along the trunk of the tree.

If you really want to climb spurless, you'll have to determine for yourself if you trust it or not.

I suggest you use the false crotch technique. Throw a throwline over the middle of the canopy,and pull a semi-static or static climbing line completely over the tree.Then attach a pulley on one side and in that pulley must be your 2/1 semi-static climbing line. Then pull the pulley up into the canopy and secure that static climbing rope to the base of the tree and securely lodge it between the branches up top, by pulling hard on it a few times, using your own bodyweight. Make sure it can't rise up when you are on the ascent. You could use the assistance of a ratchet strap for double safety. Now you have a 2/1 climbing system with a pulley installed. You also don't have to worry much about those fronds falling down now, because you are not attached to the trunk in any way, so they can't pull you down or get you lodged in between them.

But really, ask the Aussies and Kiwi's for a confirmation on this one.(You won't have to reallyask , because they'll automatically pick in on this one....) They are the experts on the matter and can probably give you a lot more advice then I can. Don't be surprised when they refer palms as being "shitsticks" though... There's one arb here who's really not very fond of palms... And last thing I heard, he's into the one-hand sawslingin' business...LOL