We only need to lose 2 if we want to register them all for the CL squad. We're perfectly fine for the league. I wouldn't dismiss the idea of leaving somebody out of the initial CL squad, it's 8 games until registration reopens it's not the end of the world.
I said this last season but I firmly believe teams will treat the league phase less seriously and will play second string sides to get through and not worry about placement, PSG won the thing after scraping through the league in last place proving it matters little, there's more benefit to resting players to prevent burn out and injury than finishing high in the table. With that in mind, omitting a player or two at least until the group phase is done isn't going to be a big deal.
I know it would appear he might be off but as an example, lets say gundo stays and hes left out of the CL squad but still features in the league, given that he expects limited game time due to his age, Is it going to be a problem? I doubt it and we get much needed cover.
Alternatively, one of the younger lads still learning who is unlikely to play in those games anyway is left off, is that really going to harm his development?
I can see this becoming a more popular practice with the expanded calender and more injuries to contend with, it just needs 1 club to do it and be successful before everybody does it. Chelsea shown the theory of it could work reasonably well with their conference league stroll with their B team albeit at an extreme number and at a substantially inferior level.