I found myself in the same situation where I couldn't afford to replace the whole LED lamp assembly but desperately wanted better and brighter lights. That's when I stumbled upon xenons4u.co.uk. They had a bunch of options for upgrading halogen bulbs to led ones.
I ended up getting a set of LED bulbs from them. They weren't very budget-friendly but were worth every penny. The installation was simple and very convenient.
I'd highly recommend checking out
xenons4u.co.uk for your bulb upgrade. They made the process super easy for me, and I'm sure they can help you find a solution too. Hope your issue gets resolved soon!