On the topic itself ...
I used to love practicing on the course. My prior home club had an executive course and plenty of times there would be nearly no one on it. It was great for working out the irons and wedges and getting ready for the season.
Sadly, it just isn't really possible to do that anywhere around here now. It's tough even getting on a course without having at least one other player with you and that makes practice not really feasible.
No I didn't do it own my own.
When I first started I got 3 private lessons for 2h each with basic lessons in irons, chipping and putting.
During the first winter I also had a couple of extra lessons with irons/driver/fairway woods.
When spring came around I got a couple of lessons with chipping and putting.
So I had a lot of lessons in the beginning but since then I also practice every change I got during 2020.
On average 2 times a week with 1-1,5 hours on the driving range and 1 round on our 6 hole par 3 course.
Practicing "real" golf on that par 3 course has helped me the most I think.
Ideally you would want something with more weight change ability. Even pulling the 3.5 all together isn't going to get you much change in SW. I ended up dropping about 8g to get where it felt right in my Epic Flash I used. But if it's all you've got and don't want to spend more on an experiment, then give it a go. I would suggest that you find a shaft as counterbalanced as possible in that case to try and even out the weight.