I'd be really interested to know what you think can bring to the table. If you think the market in the UK is untapped, you likely need to do some more market research. There are plenty of artists in the UK, resellers of mods and gaming stores that carry pro sound/backlit gameboys. I've had to leave a shop empty handed cuz the retro gaming shop I went to was already modding their own.
I applaud you for coming in dry here, but the chiptune scene isn't 'untapped' - if anything, it's thriving and alive. The problem is, there's no money in it. If there was, they wouldn't run Kickstarters, fundraisers etc just to have a fucking knees-up. If you come in thinking modding is easy, you'd be right, but being good takes enthusiasm.
As Jellica says, the beauty of the scene is for those who musically want to make something out of nothing. If you can't afford a Fender, you pull a gameboy out of the attic and buy a chinese cart. Many people with years of deep electronics experiences struggle to make a living off of it and they already have an established fan base and mind-blowing, ground-breaking ideas. Kitsch beat me to the punch but the way to get ahead in the scene is to be really, really into it (or drink the tears of your enemies helps) You can't fake enthusiasm. Although don't let that stop you. Just don't think that people aren't 'trying' hard enough. Commercially, there's no value. Socially and emotionally: sure.
I recently returned a couple of gameboys to someone who had bought them stateside. The pro sound had gone on one, the screen had a bubble on the other. I took them apart, fixed them up and returned them. He asked if I wanted money. It was actually too much bother to even hook up a brother with a paypal account for a simple job. I'd got enjoyment out of it, and was happy to help. I'll bump into him at Superbyte and we'll have a beer and bond. This is pretty common in the scene so no amount of market research and two decades of running a business is going to allow you to undercut 'free'