"although it is desirable" is a correct and usable phrase in written English.
You can use it to indicate that something is desirable, yet not necessarily achievable or realistic. For example: "Although it is desirable to be able to do all of our work from the comfort of our homes, unfortunately it just isn't practical in most cases."
Although it is desirable to avoid connection with public networks, for some applications this may prove unavoidable.
Although it is desirable to maximise the spectral efficiency, it may be necessary to maintain a fair distribution of resources to all users.
Although, it is desirable that an ideal DCA has all these properties, some of them are in contradict to each other.
Although it is desirable to determine the reconstruction parameter that is optimal for every patient, nevertheless the same reconstruction parameter is generally and constantly employed in clinical treatment.
Although it is desirable to ascribe a single "effective" grain boundary diffusivity to a polycrystal, this quantity is a complex average over the grain boundary character distribution, in view of the network topology and connectivity among boundaries of different character.
Although it is desirable to have an objective assessment approach to compare contrast enhancement techniques, unfortunately, there is no accepted objective criterion in the literature to provide meaningful results for every image.
Although it was desirable to assume a number of values for L 3, we assumed two values because of computation cost.
However, blood glucose was measured using the OneTouch Ultra2 glucometer which did not have Bluetooth functionality although it was desirable.
Although not essential, it is desirable that T′dTe = I and that T = T′.
Facebook has more advertising inventory than it knows what to do with, although not all of it is desirable.
This puts some strain on the terminology — offhand, such sequences appear to be as non-random as they come — although to be sure it is desirable that probabilities be assigned even in such sequences.
