"although knowing" is correct and usable in written English.
You can use it when you want to make a comparison or contrast between two ideas or situations. For example: "Although knowing the outcome was unlikely, I decided to take a chance and go for it anyway."
Although knowing him as I do, I wouldn't put money on that.
Although knowing the strength of SiC block is important for the reliability assessment, it is difficult to evaluate a large-scale ceramics structure without destructive test.
And although knowing your way around the technology is still vital, tomorrow's games designers will also need skills more traditionally associated with film or theatre.
Self knowledge has long been established as one of the hallmarks of great leaders – although knowing yourself doesn't necessarily mean you are a joy to work with.
Let's accept that explanation for the sake of argument (although, knowing fans as I do, Clemens might very well have received an ovation).
Try not to judge until you have heard me out, although, knowing something about you, I realize that will be difficult, perhaps impossible.
Although that knowing wink afterwards was priceless.
Although apparently knowing where he is heading, the 33-year-old still conceded leaving Ferrari was tough.
Whether or not you share their pleasure depends on whether you are amused by spinoffs that, although terribly knowing, are creatively second-rate.
The new government has shown some commitment to fiscal and monetary discipline, which is a good start, although without knowing what the oil price will be, the size of the budget deficit is hard to predict.
Although not knowing much about Alice Cooper either, Bruce decided to fly to Arizona and coach Cooper on his parts.
