The procedures aren't the problem
No matter where it is, all of us can probably cope with whatever procedures are imposed. But if there is another, more substantial, event at the same venue i.e. AeroExpo, then LAA rally may lose customers. My pitch would be that they need to vary the venue, so that there is something different/new to arrival. Even revisiting Cranfield could be interesting, but maybe go North - Church Fenton could be welcoming?