I like out of the box thinking as well and also came up with something like this, only for defense instead of offense, to keep salary low and switch players defensively. Of course the downside is slower training, harder to find players to buy to complement your team, but if you truly believe in your idea and you've thought it out well, and you actually enjoy experimenting, you should do it of course. There's very few managers that have actually tried stuff like this thoroughly I think, so most people that advice not to do it probably don't have real experience with it. I'm not saying I have, but you play the game for fun and if this is how you get more fun, why not?
But yeah, disclaimer is that it takes a lot of time and if it doesn't pan out you could have "wasted" that time. If you enjoyed doing it, you probably learn a lot from it too so don't be too hesitant to try :)