I did as you suggested and added a few spare keys.
I called the dealership, and was quoted a high prices for keys that did not have any built-in electronics (aka smart key).
- for the 2017 Honda Rebel CMX300 & another bike I have.
I am enclosing a picture of the key type/model number, where I purchased my recent set.
While they are not "fancy", they do work fine as inexpensive spares
You may be able to find a local locksmith that carries the same key model # of hd109.
Recommend that you write down your key code, to an email to yourself.
If you have that written down, you can have a spare created while on the road.