Yeah. I just don't see it being a problem. If they are doing it for the Professional Leagues, I can see them open the border for the CHL. It may not be PRO but it is close enough to receive an exemption provided they are able to follow the same procedures as the Pro Leagues.
That said, I too like the idea of using thee neutral cities to see what kind of $$$ can be generated there. It would be a nice controlled experiment.
Unfortunately at this point in time neutral siting the U.S. teams maybe to OHL's only option. Yes there will always be that debate that the 3 American teams that are in the OHL their host cities would lose on local profits to be made and that the families and fans in those cities would get feathers ruffled due to the fact that they have paid for tickets and prior to the season starting. But looking ahead here and seeing what the OHL and as a whole CHL could do neutral siting teams maybe the only real way to get 2020/21 off the ground. I like your idea of a controlled experiment theory place the 3 American teams in locations that are as close to the main cities as you can get that would cover the fanbase accurately with a reimbursement/OHL Live stream option for those cities with proper radio and newspaper coverage to keep the local fanbase cities aware of what's going on with their teams, and yes not every fan is going to like it for the time being but as a temporary solution even if it was for just one season that would be the safest and best feasible option for the time being.
As we all know the CHL solely bases it's decisions on what the pro leagues do but this could benefit in a few different ways.
1. Players safety could be closely monitored for health and safety
2.It would as you pointed out a chance to experiment in different locations for potential expansion/relocation in the future.
3. Allows the bulk of the CHL players who are coming or returning to the league to have a season for 2020/21.
That being said even for those fans in American cities if they weren't able to view games through OHL live stream each one of those cities does have local media coverage through newspapers and radio stations which in the this rough idea could be used to re-transmit the broadcasts to those main cities. Even if you split the profits 50/50 between the cities who would play host and the teams it would still work as each of those teams would be making profit.