How about "Recently joined associate".....noobie, nubie, newbie, newb, etc. are traditional web terms.
imo, it's fine...maybe change the spelling to 'newbie' reflecting that they are "new" members rather than new to BMW or cars in general.
2004 E60 530is, Delivered 12/12/03, TiSilver/LGrey, PP, SP,PS, PDC, ACC, FRS, Step, Xenons, clear bra, body colored rear inserts. (Retired, 1983 henna red 320is)
2004 Corvette Z06 Commemorative Edition