I do this all the time.
Bring a laptop, make sure there’s wifi. Whack everything in Lightroom, make basic adjustments and export the images. You’ll need a system to work out which photo goes to which person in the case of headshots, or maybe have an online gallery where anyone can visit and just download the image. It needn’t by pretty, it’ll just need to work given the time constraints. Maybe a google drive would do it, then all you need to do is share the link.
Ya know, I’ve been to about 50 major cities in my life and have only been offered meth precisely once - in Rotorua at a red light when I was waiting to cross the street to the lake and a van pulled up and said “hey bro, do you want some P, bro?” I said no thanks and he said “sweet as all good” and drove off.
That’s a shame you missed the awe inspiring beauty of Hamilton’s high street at 3am on a Saturday.
Next time you come here you can borrow my tripod :)
When you resize an image for screens you get a boost in sharpness anyway. Try it.
I think they fucked it up and don’t know how to tell you.
Give them an ultimatum that the images by this date or you’ll “investigate legal options”, and if they don’t budge then take them to small claims court or whatever the equivalent is. It’s business. Protect your investment and your own money.