Hi again, - nice to see you re-engaging with the community. I recall one of our last conversations had to do with the Himalayan Salt Lamps.
While I'm hopeful others will see your inquiry about portable nebulizers and respond by sharing their own personal experiences, I have something to contribute as well.
We actually have a good number of articles written which focus on this topic. The information there might give you some ideas while you're shopping around. For your convenience, here is a link to several of those articles: https://asthma.net/search?s=portable%20nebulizers. I do hope you find this is helpful in a practical way.
I'll bet you are looking forward to traveling come summertime!!
All the best,
Leon (site moderator asthma.net)