I said it once I'll say it again:
Are you measuring your levels between water changes and noticing they are falling further than you want? Just wondering what makes you want to dose all of this to start.
IF you are seeing your levels drop of things like Alk, Calcium, and Mag between water changes, then it's a good idea to start dosing those 3 elements. I've found trace dosing is not needed as much in tanks that do frequent water changes.
Have you bought test kits for test your trace elements and determined they are below what you want?
Don't just start dosing because it's been a "certain amount of time". Get the test kits, do the measurements, and let the hard numbers dictate your path. Otherwise you are aiming for a target you cannot even see.
That Alkalinity target of 11.5 is SUPER high. I'd recommend Red Sea blue bucket salt for a more manageable Alk level. Somewhere between 7-9. 12 is very likely overkill and not appropriate for your system given it's age and lack of SPS corals and low nutrients.
Given that you've put so much effort into getting good dosing chemicals, and will be doing a lot of testing and measuring and logging before you buy anything, why would you negate all of that effort by getting "budget" dosing pumps? You can get all the best chemicals and perfect the amount you need to dose per hour but if one of the dosers fails in the "on" position, it doesn't matter. Just a thought. Maybe wait for it to be too much of a pain to dose by hand, chemical by chemical, and get a nice, single headed dosing pump as needed. Something like an Ecotech Marine Versa. There is no need to jump all in at once.