Hi, and welcome to the forum. It is a great place to learn, but sometimes it's a bit slower than others.
Sure we can give opinions, but some(like mine) you have to take with a grain of salt.
The pros really need to help you out with your situation, but I'll give a few idea......
I don't know if you want to remove any LMB until you get the crappie situation under control. They could help you remove a lot of small ones that you can't catch by line. I think I would concentrate on the crappie first.
Is a net a good idea?- well it is if it works. You won't know till you try. Never used one myself. It sounds like there are a lot of tricks in getting it to work right, some of which may be out of your control. Like obstacles in the pond's bottom. I would look into a fyke net. There has been a really good thread on this by MNFISH, just within the last week or so. He uses it to control his crappie pond.
I think you have a great opportunity to learn pond management and then you'll be able to apply it later on your re-done pond. You will have that much more knowledge in 5 years, you'll be so much better off because of it. So stick around, have some fun, learn a lot, and don't be afraid to ask away.
...Jim
