The only reason I am asking for that options is that even an unprotected system will be safe if it's not infected so why even invest in a keystroke obfuscation if you are testing it against a clean system? What if you are infected and you don't know it? Which key stroke protection solution would protect you against an infection that you don't know you are infected with? I. E. Persistant Threat of unknown origin and definition?
I totally understand you concern, but that protection feature works on paper, but do you really know it is effective? How would you know?
Some people that I know, installed Linux along side Windows just to do online banking. They boot into Linux, start online banking session, when they are done, they shut it down.
BTW you can create a Bootable Ubuntu USB and use it for online banking. If you plan to do that, just invest in a fast USB3 flash drive.