Big advantage of using the captured T34's (and I would add the KV-1's) in NA instead of Russia is that there would be far less friendly fire incidents.
As the soviet tanks would vastly differ in silhouette compared to the british tanks.
According to my memory they had captured 45 of them combined by end of '41. Allowing for 3 companies, or 1 panzer battalion in the 15th panzer division.
Regarding spare parts while not ever lasting, I think it is safe to assume more then enough parts could have been scrounged from damaged and abandoned T-34's in Russia to keep the tanks going.
For logistics for getting the the T-34's from Russia to NA, remember the trains going west where mostly empty. Leaving lots of space for captured scap and tanks to get to Italy. From there it would have been equally as difficult to move T-34's or PIII to Libya.
In regards to the air filter, all these tanks would have had to been overhauled for service in the Panzer units anyway. Adding things like radio's and proper optics. Making the tank ready for dessert conditions would have been done at the same time.
Also this was the composition of the 8th panzer regiment. The main armoured part of the early Panzer Afrika Korps.
Type
Number
Pzkpfw. I 14
Pzkpfw. II 38
Pzkpfw. III
(37mm) 76
Pzkpfw. IV
(75mm Kz.) 21
PzBefw. 9
So trading the PzI and PzII for T-34's would be a major upgrade.