Yes it is possible to bypass an In-Floor Cleaning System. My first question would be, why would you want to? In-Floor Cleaning Systems are much more efficient than any portable cleaner.
If you are having problems with your pools cleaning performance, I would look into flow adjusting your cleaning heads, before investing into a cleaner. Also It will probably be cheaper to repair the floor system, than to buy a portable cleaner The easiest thing to do would be to buy a Polaris Suction Cleaner, such as the ATV. This can be installed via the skimmer fairly easily.
If you want a pressure side cleaner, then you would need a dedicated return line. If you have wall returns already plumbed in your pool, You can retro one these lines to feed your Polaris. Polaris sells a return kit allowing you to do this Good Luck INfloor Parts.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.