The cottonseed meal, Bone Meal, and Kelp all helped bring the levels of P and K to where they are, one reason to not add those things to your soil without a good reliable soil test. There is really not much you can do now except wait for those nutrients to leach out as they will over time.
Excess levels of Phosphorus in the soil will interfere with a plants utilization of Zinc, Iron, and Cobalt and excess levels of Potash can prevent a plant from properly utilizing Nitrogen.

Would you any nitrogen this year?

A pH of 6.7 is hardly alkaline and cover crops are pretty much useless in an ornamental planting bed. Also the kelp meal and cottonseed meal - if applied according to package directions - had no effect on phosphorus or potassium levels since they contain virtually none of these nutrients. It is likely these levels were similar before any amending took place as both of these tend to be adequate to high in PNW urban soils.

These levels will decline in time - I'm not sure I would be overly concerned. And you can tie up excessive phosphorus by adding a mixture of other mineral fertilizers, like magnesium sulfate or iron sulfate. Iron sulfate would likely be my choice as a soil pH of 6.7 tends to bind iron. And yes, I probably would add some nitrogen to offset the stunting or limited growth that comes from excessive levels of P&K and because nitrogen is typically lacking from our soils.. And I would use the cottonseed meal again - first because it is a great organic source of nitrogen and second because it is a natural acidifier. I'd be a lot happier seeing that pH down to about 6.3-6.4.

FWIW, liming in the PNW is virtually unnecessary. Most often folks want to bump up their acidity. And for future reference, amending soils for new plantings here requires little more than just adding compost. I would avoid adding any other amendments or supplements until a soil test indicated a need.

Alfalfa is a pretty plant with beautiful blue flowers. See link. I have 3 different ornamental grasses growing in my flower beds, and they're beautiful. You can choose to skip even considering cover crops because they "are useless in an ornamental border", or you can think outside the box, be creative and imaginative, and find plants that heavily take up potassium and are still beautiful.

If you read the link I sent you, you'll see that it's not a difficult process. The Seattle rain should help you on this. All you're doing is speeding up a natural process.

IMHO, it is better to follow or speed something that nature would do eventually anyway.

Here is a link that might be useful: Photos of Alfalfa

First, your pH @ 6.7 is very slightly acidic, and in a range I like for all-purpose planting. Unless you're planting things with unusual needs (azealas, camellia, blueberry, etc.), you pH should be fine.

Both high P and high K can and will affect plants ability to use micronutrients. High K and especially high P will take time to resolve. P is not very mobile in soils, and K while more mobile tends to be a bit lasting.

You will still need to provide regular source of N - that disappears comparative quickly. Depending on what you grow, climate, and how you provide that N once a year may be enough. If you want to stay with an organic source bloodmeal would be a good choice - 11-12% N, and typically no P or K. Stay away from the bonemeal (typically ~ 11%P), kelp (typically ~ 2.5% K) and cottonseed meal (~ 2%P and 1% K).

As far as correcting the P and K, you can help the K along a bit by leaching as much as is prudent. But I doubt you will be able to do much about the P. Both will move better in more acidic soil, especially the P, but there is a limit to that too. A bit of garden sulfur to try to edge the pH down a tad might help a bit, but not much.

I think a better approach would to try to compensate by boosting those micronutrients that correlate with the plant deficient symptoms you're seeing. Just go easy - you can always add a bit, and if the effect is positive add some more. But once you add, it's going to be in there and not much you can do.