There seem to be numerous mentions of aerobatics!
A group aerobatic aircraft need not be that expensive. Of course it will depend on what it is and its condition.
Most people find joining a group is the best thing they have done. Some the worst.
It will always be a bad experience if it is a bad group. This will turn into poor availability, high and unexpected bills and potentially all sorts of other hassles.
This simply proves the importance of carefully considering any Group before you join. Find the right group and you will find good availability, on the whole predictable costs, camaraderie, and, with luck, will learn a great deal more about flying.
Unfortunately, short of forming your own group, you are "stuck" with whats available at your local airport(s). Obviously there may or may not be something that fits. Ask around and sometimes it is surprising what can turn up.
NPPLs and paramotors will prove very different experiences. They might suite you, they might not. I'd try out a flexwing or anything that is not certified first. I know nothing of paramotors; presumably they are difficult to "try" - can you fly one tandem? I suspect they are a lot of fun, but I also suspect you are very limited by the weather as to when you can fly - probably not ideal given the latest British summer!