I love to eat small amounts of almond butter, and also brazil nuts, macadamias, pecans, walnuts - as a post-dinner treat with keto ice cream, or as a pre-dinner appetizer (I don’t count nut protein as part of my daily protein intake because it’s an incomplete protein) - about once a week. The key is “small amounts” and “infrequent” though!
If one is concerned about phytic acid *esp in raw nuts) one can simply soak one’s modest serving of raw almonds or whatever other nuts the night before in water, and drain & rinse in the morning. It removes most phytic acid and plumps them up beautifully so they’re much more like the fresh nut from the tree. Or you can sprout 'em, or roast 'em. Also, most almond butter for sale in the U.S. is made from steam pasturized or roasted almonds, which probably has much less phytic acid than the previously sold raw ground almond butter in health food stores (though not as sweet a taste).
Both the Drs. Eades and Phinney & Volek allow for nuts for emergency snacks during fat-adaptation - in modest amounts, like 1/4 cup - as a way to help nut-snackers not feel deprived, but they caution about avoiding roasted & salted nuts, as most folks cannot possibly stop at 1/4 cup!
There’s also the ancestral foods perspective that it takes a lot of work to harvest, shell, and prepare nuts - and our ancestors probably ate very small amounts of them:
“Back in the old days, if we wanted 500g of nuts for a recipe, we’d have to find a nut tree and then sit and crack them all open by hand ourselves. No doubt this helped limit how many we actually consumed. Nowadays we can consume kilos of them without a second thought. This makes it more important to prepare them properly than if we were just having a small handful now and then.” https://treadingmyownpath.com/2013/08/26/roasting-soaking-sprouting-activating-or-eating-raw-a-guide-to-eating-nuts/
As the OP and anyone else is concerned - regardless of any phytic acid concerns - keeping the nut servings “small” may be difficult if you’re using them to fulfill a taste craving and it can mean a slippery slope to slower body recomposition if you’re packing in daily abundant amounts of nuts. The Drs. Eades and others have written about the importance of being sparing with these energy-dense foods.
At the same time, I heartily aspire to living a little, and fat-adapted inclusion of various foodie treats. Low carb chef George Stella has a amazing easy recipe for honey-mustard roasted pecans in his quick & easy cookbook (he has like 7 cookbooks, and I just use the easy one). But I’d only make flavored roast nuts for a special side eaten with a whole protein meal. The company Legendary makes a magnificent almond-pecan pie flavored nut butter I get on Amazon (sweetened with stevia and erythritol and with salt added) - I’ve been successful at limiting myself to just 2 tblsp per serving (as a dessert or as a standalone small meal with additional foods), only once a week. It’s expensive, which also helps me treat it as special. 