I like modding my TWSBIs it would seem.
This is the pink TWSBI Eco, but I have modified the feed (read: cut) so that it would work with a Mabie Todd No.2 flex nib (made in England, for those interested, not New York, US as it makes a difference). You can't press it to total limits, but it works impressively well!
You can read my write up of it here
This pen isn't currently inked. I have a number of shimmer inks if you'd like to try I would be happy to ink with. Just let me know!
£50. This includes the mod.