As suggested, you *can* get TQFP adapters, although these are of course ''quad' as opposed to dual, you can cut one in half, and glue them together on a blank substrate, essentially bringing two sides closer together. As far as I am aware, these are the only 0.4mm adapters available, at least here in the UK.
Another google revealed this for the OP:
Proto Advantage - DFN-6 to DIP-6 SMT Adapter (0.4 mm pitch, 1.2 x 1.0 mm body)
As for TDFN14, given the number of pins each side, I'm afraid I don't see a way of using standard 0.5mm pitch adapters (which will work for < 4 pins each side, up to TDFN8). All I have found are QFN 28 0.4mm pitch. Unfortunately, the centre pad is 2.4x2.4mm < - this seems to be the exact distance between pads on the underside of a TDFN14.
Tough one eh? I've only managed to make 0.5mm pitch footprints PCB's (up to TQFP144) with press-n-peel, 0.4mm, although the 0.1mm difference, I fear wouldn't be easy.
A final last ditch option, would be to find a PCB with a TDFN14 device on it, and replace it with your chip = not good for more than one. At least it would likely break out the pins to larger pads to other components.
Just had yet another idea lol, this one *might* be more practical. You can get FFC flex cables in 0.4mm pitch, many are made from polyamide, which can withstand soldering temps. This means you have a flexiable 'PCB' with tinned 0.4mm pads on each side. Sockets are also available for them, which have dual 0.8mm pins either sides. Again, this is ridiculous amount of work, sounds like you might as well just get the PCB adapters made up. Sparkfun are pretty cheap for small adapter boards in quantities 10+