Fairest simple solution - if you DC, you have a 50% chance of not losing your materials, same as if you failed the synth without Reclaim. As far as I know, DCing = 100% chance of losing all the mats, but failing = 50%.

If you had Reclaim already up when you DCed, it should be a 90%/10% chance, but that would require them to know you used Reclaim when you DCed, which is unlikely possible without being able to just save the whole synth anyway.

If it's possible to keep the mats on a DC with a 50% chance already, ignore me