Panzer impression of any kind would be very impractical unless you own a tank or attend living history events. Tank crews did not wear y-straps, did not carry ammunition pouches of any kind and did not really have any gear on since there were confined to a tank. You would be running around the field with a pistol, MP40 with no spare mags and maybe one of these since it was used to keep ammo inside of armored vehicles.
https://www.atthefrontshop.com/Produ...de=GGAMP406PKG
Officer impression would also be very impractical and very expensive ( decent impression will run you more than $1000 ), especially if you are thinking about joining any existing airsoft/blank fire units later on. No organized unit will allow new recruit to wear officer's insignia.
Like I said, look at something simple and common. Infantry, maybe panzer grenadiers.