So on the off chance anyone else was hoping to keepsake a pretty set of "Custom-fitted spiked masterwork armor," let me save you the time and money. Jagex forgot to make it possible to keepsake the set.
I ended up dropping about 56m and $6 to re-keepsake my set but with spikes, as well as add a helm since you have to custom-fit it before you can spike it, all to find out "Surprise, Jagex forgot to add that this isn't keepsakeable." Yay.
I don't mean to rant, but I just wanted to ensure that if there was any way I could save another player some time and money, I'd definitely try. That and it'd be just super if a J-mod happens to notice this and fix the issue. Also for any curious, I did also try repairing the armor to fully repaired as well to ensure that wasn't the issue.
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