I hate to have to tell you this but none of those medications is appropriate for what you need or comparable to the other medications I suggested. If you use any of the products that you listed you would only serve to waste your money and likely cause a faster death to your fish.
The best thing I can recommend for a situation such as yours is to get a quarantine tank asap and move the 2 sick corys out of the main tank. This won't guaranty that your other fish won't contract this problem, but the chances of it infecting your entire tank are much higher if these 2 obviously sick fish remain in there. All you can do without appropriate medication available is to watch the sick fish (in quarantine) until they appear to be suffering (unable to eat, can't swim properly, etc) and then to humanely euthanize them. If any of your other fish begin to show the same kinds of symptoms my advice would be the same for them.
When dealing with this kind of protozoan problem it will eventually get into their neurological system and affect muscles and the ability to move properly, breathe properly, etc. Sometimes it can be visible as a bent spine, uncontrollable twitching, rapid gill movement/distressed breathing, and an inability to hold their bodies upright (drooping back end) as they swim. When any of those things is present it is best for the fish to be put down so as to avoid any unnecessary suffering.
I'm sorry I can't be of more help to you but there are only very specific medications that treat for that type of problem. I hate having to tell anyone that their situation is hopeless, but unfortunately, the laws that control the availability of medications in some countries don't allow for anything else.
Its going to be very important for you to watch your other fish, especially the other cory catfish. This type of situation is highly contagious and since it is internal, it would be in an advanced stage such as your current sick fish before you would see evidence of it.
In the future you will want to be sure to quarantine any new fish for at least 2 - 3 wks to help ensure you are not introducing new disease into your main tank, especially with such a limited number of medications available to you. The other thing I'd like to suggest is to not get any new fish for at least a month or 2, until you know for sure all of your remaining fish are healthy and not carrying this protozoan. This will help you to avoid infecting any new, healthy fish.
Again, I'm sorry I can't help you. Good luck to you. If you need further help please just let me know and I will do what I can.