The only solution for this to not happen is if international T20s get shelved.
As long as international T20s continue, IPL will continue too and the non- Big 3 will suffer because their matches will be either postponed or the third string side will be send.
This is what happened when WSC was prevalent in 70s and this is happening now as IPL is equally bigger force as WSC of that era.
If international T20s stop, IPL will become irrelevant and we can enjoy Test Cricket between all teams and even ODIs will give the vibe of 90s again.You keep crying about international T20s. IPL got their unofficial window of Apr and May but once again it couldn't get completed on time due to covid. It should not be ICC's and their member boards problem that they have to keep finding space for this pyjama league in the remaining few months every year. It should have been marked as 'completed' in May. IPL keeps killing international cricket over and over again but guys like you will only blame the one who is dying(intl cricket). What a joke.