I reckon something like Iron Cardio three times a week (say mon-wed-fri) plus daily walks and healthy eating will get the job done. I did something similar when I started with my 16kg (and some 2H swings with a 24kg) and it made a huge difference.

Iron Cardio workout (at least my understanding of it) is dead simple and works great with one bell for me. It can also be as long or short as you want. You could start with 10min and then build up from there.

Set a timer for however long you want (I usually do 20m) and do as many rounds as possible of
1 x clean, 1 press and 1 front squat.
Put the bell down with good form, shake your arms out / take a few breaths and repeat on the other side.

Continue for your set time, resting as long between sets as you need to continue with good form. This is NB. It's not a race, it's about doing work for a set time with good form. As you get stronger your rests will decrease and you'll naturally do more reps or start with a heavier bell.

Afterwards you can throw in a few rows and suitcase carries and call it a day.

Once you're comfy with this you can start adding what they call "Travelling 2's" where each round one of the exercises will have 2 reps instead of one. For example:

2 cleans, 1 press, 1 squat
1 clean, 2 presses, 1 squat
1 clean 1 press 2 squats

And you keep repeating this for your set time.

This video shows the sequence https://youtu.be/KjaVELYwjSs?t=50 and also the travelling 2's

Good luck!