This is not aimed at the OP or anyone who has responded. I bang on about this every time this topic comes up. I wish someone had in the early 80s when I was laying the foundations of my hearing problems. You can experiment with systems which are not moulded. But why bother? I would sell all my basses and associated kit if I could buy new ears. I cannot. If £150 is more than you can afford, then that is fair enough. But if it is remotely affordable, or you have to save up for a few months then do it. Get them with a lanyard in them. Get them in a lurid colour so that when you drop them you can find them. If you really want to treat yourself then get some of their sleeping ones at the same time. Complete game changers.
But do not skimp on your ears. Ever.