Go for it, do big numbers and there's a larger chance it might work.
I got to be honest with you, I'm a seasoned veteran in plant care and plant biology, but I struggle with propagating junipers that seem to work just fine for everyone else. And I too have had pines die on me; JBP in my book is not at all the king of bonsai, it's a spoiled nepo baby that's being cuddled too much by the world.. Simply because it's the only pine I can't keep alive no matter what.
As for your current plant and changes, no. That's the thing with conifers: you do the work, you set them down, and then you just water and wait. That is it. Every time you change something, the plant will want to adjust. Causing more stress and more issues along the way. It is a plant. You did a thing, now it needs to either recover or die. Every time you change something, will blur your learning process.
When your car engine starts making a thumping noise and the check engine light comes on, you stop and call assistance. If you instead keep driving, that engine isn't going to magically heal itself. The same is true for plants, unless you can absolutely sure tell that the condition it's in is causing the problem.
Leave it, care for it as you should, and wait it out. This is a multi-year recovery process, if it lives, hence why I advised to just get another or start from seed. By the time this plant has recovered, your seedlings will be of the same size.
