Could it be done in 5 seconds? If had the folders ready to do and just changing ba to full action....could get close...
The issue is larian didn't give us a chance to playtest some of the core 5e rules. If after testing so many players found we need hide as a BA for everyone...or we need diff shove rules from 5e..we could go fair enough, there's data, lets diverge from 5e rules.
If larian DO change rules closer to 5e I can already hear the complaints from some players saying they preferred it per EA.
Mostly sure no one would complain as each time they changed something.
Many people here and on reddit argued when "we" constantly asked a rebalance for backstab, highround advantage, lowground disadvantage, jump coupled to disengage, disengage BA,...
Did you see any complaints from people that were complaining about these suggestions after patch 5 ? I did not see any. I guess everyone realized that combats are so much better now.
It would be the same about shove... Especially if Larian add an item, a feat or anyhing else that allow players that really want to use shove as a BA to do it.