Changing 50% of the water once a week, the most nutrients can possibly build up is 2x whatever is dosed between water changes. This is assuming zero plant uptake.
Changing 30% of the water, the most that can build up is 3x the amounts dosed between water changes.
Changing 10% of the water every day, would essentially be like doing no water changes, and dosing 10% less than you're actually doing. There'd be an eventual ceiling where the concentration no longer increased, but it would be high.
So as far as regulating the nutrient build up, this is not a good plan in conjunction with EI. There would be a never ending rise in nutrients.
Small frequent water changes do have their advantage. A constant supply of fresh new water is good for the whole system. Plants and fish love it. Algae hates it.
I remember an old thread on Barr Report talking about if you do a 10% water change every day you'll never have bba. Dont think enough people tried it out to really put the theory to the test, but it had some merit imo. Digressing a little...
If 10-15% daily water change is the only option, then you should find a dosing routine that pretty much targets what the plants actually use, or just a tad above.
How much the plants use will depend on your individual set up. How many plants and what kind, how much light intensity - that sort of thing.
You'll have to play it by ear for a while to find the sweet spot. if I had to guess, something like 1/4 EI 2x week might be a good place to start.
Then keep an eye on nitrate and/or phosphate levels as a proxy for what the tank is actually using. I say these two because they are easy to test for.
Test maybe once a week for a few weeks. If the levels continue to climb, reduce the dosing. If the levels get too low, increase the dosing.
Somebody else may have a better solution for you. But that's the only way I can think of to run a "high tech" tank with that kind of WC routine.
You may want to look into pps-pro dosing. It does sort of
the same thing, but there are still water changes involved at certain times. I believe when TDS reaches a certain point, which has never made logical sense to me, but you may find some of the theory useful to apply in your case.
TL;DR - Find a way to do weekly 50% water changes