OK here we go

Yes there is some dry lc cat food, but the members still say try to stay with an all wet diet. Besides that we have 2 dosing methods to follow with lantus
They tell you when an increase or decrease is needed . I will give you the link for lantus , maybe I did already can't remember .
If you do feed the dry you can't follow the TR method
You would need to follow the SLGS Method
Read all the yellow stickys
https://felinediabetes.com/FDMB/forums/lantus-levemir-biosimilars.9/
Just a quick explanation but you should read the yellow sticky
SLGS: You hold a dose for
7 days (unless a reduction is earned). You decrease the dose when the BG falls below
90. The aim of this protocol is to keep the cat in the
90-150 range. This is more suited for caregivers who can't test as much as TR requires. You do a weekly curve with SLGS.
TR is a more agressive protocol with increases as often as every 3-5 days. Reductions are earned when the BG falls below
50. The aim is to keep the cat in the range of
50-100 (which is the normal BG range for cats). To follow TR, you would need to get at least one more test per cycle in addition to the pre-shot one i.e. 2 tests per cycle or 4 tests per day. You would also need to be feeding only LC canned food and no dry food.
You could try TR if you are feeding LC wet (and no dry) and if you think that's more testing than you can manage, you can switch to SLGS.
I think you should start with SLGS , you can always switch to TR
When you decide add it to your signature and SS
As for treats when you test or give insulin
for treats for testing
You can give any freeze dried treats they are all low carb
Tap on this blue link and read post #64 the post numbers are to the right of each post and you can read about the freeze dried treats I listed
https://felinediabetes.com/FDMB/threads/new-to-this-i-need-advice.269452/#post-3007388
You can even give plain boiled chicken pieces
Is this enough homework for you
Oh if you want the name of the low carb dry let me know, I'll tell you this it's very expensive for what you get and it's not sold in stores
There are a few and they are all expensive
They are around 6% carbs
Here's one 35.15 for a 6 lb bag
https://www.amazon.com/Dr-ElseyS-Cleanprotein-Chicken-Formula/dp/B07FCPBMRT
https://www.walmart.com/ip/Dr-Elsey-s-Chicken-Flavor-Dry-Cat-Food-Grain-Free-2-lb-Bag/790821573. 13.97 for a 2 lb bag
@sandysh66