Low-salt Cooking on a Barbecue TL;DR: Looking for evidenced based methods for low-sodium food prep. to be cooked on a barbecue. 



My wife has recently confessed that she doesn't like BBQ food as it is too salty! Normally, I use the BBQ during the week as a quick easy meal as you can have a decent meal (burgers or dogs or even grilled veggies) in like 15 minutes. On weekends, I do roasts or steaks or chicken (basically anything more time consuming).

However, since this revelation I am determined to find a middle ground because:


she is right, we need to consume less salt and less meat 
I like BBQ. 


Here is what I have tried thus far:


I have made my own burger patties (instead of using Costco's) this went over well but flavour was lacking (I confess, historically I have been too lazy and will be tweaking my recipe). 
I have tried store bought low-sodium dogs and smokies but it was still too salty. 


This has been going on for about 2 weeks now, of different trial and error. So what I am wondering is what are tried and true methods of fast, easy cooking on a BBQ that are both tasty and low in sodium (or effective means of replacing sodium, but not sacrificing taste). 

While, I realize that this question could end up being flagged for being opinion based so please provide either experience or evidence to help me. I am looking for methods or tricks to employ that will allow me to maintain the quick/convenient cooking that comes with BBQ food but is healthier and hopefully low enough in sodium.
If you make your own burgers you don't need to include any salt at all. You could make them unseasoned but you may find you enjoy them more if they've got herbs/spices in them. This also holds for sausages if you can be bothered to make them. Marinades don't need any salt either, though of course you may choose to add a little. Spring (salad) onion and garlic are very useful if you're reducing the salt. 

Grilled veg is often best simply brushed with oil. I like to use chilli oil or pizza oil (chilli and herb). Along with steaks, chicken etc. you can also brush with a little oil and rub in spices or herbs. 

Many sauces you might add after cooking also contain a fair bit of salt. Making your own or choosing ones that taste less salty will also help. Ketchup, for example, varies a lot in salt content.

You're probably used to fairly salty food, but your tastes can adjust fairly quickly.