I would like to make a some comments regarding your QT idea; I may get some slack for it but oh well.. its an open forum
My opinion is that the way you are talking about setting up a QT would most likely do more harm then good. You may be wondering why I say these crazy things, so let me explain.
We all know as a tank develops it becomes more and more stable and the ecosystem evolves into much more than just tap water with fish in it and a bit of dechlor. With that said, a QT tank that gets setup and taken down regularly will not come close to the quality of the main tank in this regard.
Second point, to truly quarantine a fish to ensure its healthy the common 2-4 weeks is a joke. If you look at any major public aquariums and ask how long they QT their new stock before it goes into their system you will be shocked at the amount of time. so in order to replicate this you would need to QT for multiple months, in which case you tank should be fully cycled and meet all the size requirements for the fish you are quarantining.
Another thing to consider is that your QT tank and your main tank will have different water parameters and all tanks hold pathogens in them. which means while the fish in QT may seem healthy and stress free once you have to catch him to move him he is now in some stress. then you move him to a completely new home with different water parameters; he is now more stressed trying to adjust to a change in environment. Lets say you have other stock in the main tank already and they have territories established. You new fish is now feeling lost and resorts to hiding in the back untill he/she feels comfortable enough to begin exploring. All of this is stressful, and while the stress will not kill the fish it will cause its immune system to note function at its full potential. this allows for diseases to take hold. your now once healthy fish shows signs of illness a week into its new home.
i have provided some links to show you that I am not the only one who thinks this way and that the idea of a QT is great but it must be done right . These are also great reads and will give you more insight to proper qt and how to avoid making common mistakes.
Can quarantine tanks be a good thing? HELL YES. BUT they must be done right. and a 5g / 10g for pearls is never going to be considered right. most people would not keep fish in either of these tanks long term, therefore they are not suited for a qt tank.
Hospital tanks are different story and a 5-10g is fine. tanks can be torn down and should be torn down right after treatment. but thats a different topic.
I hope I have shed a bit of light into the topic.