
Hilly - my suggestion, honestly, would be to keep an eye out for a rescue fawn. It will take a long time but they do crop up - and as they are getting more popular, more of them will end up in rescue.
I have spent years (literally) trying to find a decent, responsible breeder who has fawns show up from time to time (you will not find one who breeds them deliberately) and I have never yet managed to locate one. I've seen breeders with brown or black dogs that throw fawns in their litters - but the breeders brag about it, and I wouldn't touch them with a bargepole. The way they are being bred at the moment seems to be akin to the albino dobes - it's all about the colour and the money, not the dogs themselves.
Problem-wise the main issues are colour dilute alopecia and skins problems - Remy has both in spades. He's as light as he is because almost all of his main coat has gone now - it was sparse as a pup but he started to lose it at 2yrs old. Skin-wise he gets pimples constantly and quite often I have to shave a small patch of his back to get them under control again (with hibiscrub etc) - and because of the alopecia, those patches will literally take months to grow back.
I would also be willing to bet that fawns will be more at risk of the other problems associated with dobes - hypothyroidism, DCM (heart disease), vWD etc - because the people who produce them deliberately do not, IME, perform the necessary tests on the parents to protect against those problems (or to aim to breed fawns/blues with the coat and skin problems). They are just out to make money.
Keep your eyes peeled, I have seen a few fawns this year looking for homes - they do pop up now and again.