Your proposal is fatally flawed since the leftists don’t care about anything other than total control of everyone, period.
WE are standing in their way of total control of everyone... If we explain to them that they'll have total freedom to force their beliefs on all people in their country they'll agree. The little thug in North Korea - a commie hellhole - doesn't need control over people living in France - the broken slaves of his 'homeland' are enough. It'll be the same with liberal 'elites'.
We tell them they can disarm all THEIR citizens, make lists of words and thoughts they can have and CAN NOT have, and they'll join our side.
They would love to have us out of 'their' country.... and we can give them that. Agree and tomorrow - Trump is NOT President of THEIR country. That alone should get them to join with us.