@ckie am very late to this party, but! i have had super results from Flomasks, for myself and my child. I'm immunocompromised and haven't gotten it while flying with a flomask, and my child hasn't either (and is also small enough to need snacks and drinks mid international travel). i pair it with a co2 monitor to pick a decent-enough spot or time to do that or meds or what have you. Flomask has import license to EU, but expensive shipping (and i had to pay vat after the fact) but for me it's worth it as they're so much lighter in weight and people don't hassle as much as large respirators (some airport and airline staff will arbitrarily get upset and demand you not wear full respirators, which is supposed to not be allowed but is of course still happening).

otherwise i see you got a respirator so maybe that one will already work for you! if not then this is another option :) I've only used it and p100 respirators, haven't searched around for ffp3 since moving to EU so I'm gonna look into the one you got already for myself, too!