Gamestop US have the digital copy of Has-Been Heroes for $9.99, as the Switch is region free you can buy it and apply it to an american account to download. When I did this earlier it was 8.12 however this may fluctuate slightly.
To be able to purchase it you will need to:
1. Use Paypal checkout
2. Use a random US address (optional choose a tax free state such as Alaska - although I think digital is tax-free but no harm in being safe)
3. Follow the rest of the purchase as you would normally)
4. You will need to confirm the order back on the gamestop website
5. The code will be on the final e-receipt under the title (I still haven't received an email so assuming I won't) This is important as once the page is left you may lose access to the code
6. Enter that code on the eshop using an american account.
You will need to have an American account on you Switch for this to be downloadable.
It may be a little bit of work but you save £10 so worth it I think. I wasn't going to try this game at all but for £8 I don't mind if I don't enjoy it too much