I believe it's possible to go to the MIB2, but not the 2.5.
From what I can see though, pricing on the MIB2 (or if it's even possible the 2.5) is waaaaay higher than the RCD330+/340/360 Pro at about $500 or so depending on where you get it.
Some examples:
VW 6.5" Original MIB RCD330 Plus CarPlay Stereo 6RD 035 187 B - Version B
VW 6.5" RCD330 Plus 6RD035187B (No Name) Radio for VW Golf MK5 MK6 Scirocco R Tiguan Passat Polo Caddy
Or AliExpress if you're game:
Android Auto RCD360 PRO NONAME Radio Carplay New RCD330 MIB Radio For VW Golf 5 6 Jetta MK5 MK6 Tiguan CC Polo Passat 6RD035187B|Car Radios| - AliExpress
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