As far as I know, the 650 Transalp carbs is not a direct substitute for the RD03 carbs
Transalp XL650V, 2000-:

XRV650, RD03, 1988-89: (Keihin 32mm )

That said, I guess everything is possible with some devine engineering.
I think it would be better to contact a company like David Silver, http://www.davidsilverspares.co.uk/ or Wemoto, http://www.wemoto.com/
or John Oldfield, http://www.johnoldfield.co.uk/ and investigate if there are any servicekits for your carbs.
Perhaps the carbs from the Transalp 600, 87-88 would be more suitable?
Check the carb bore between the two, I think most of the RD03 specific hardware could be swaped over to the TA carbs
Transalp XL600V 1987-88 PD06 32mm CV Keihin type: VDF0A A

Transalp XL600V 1989-96:

Read more:
rebuilding RD03 carbs
RD03 carbs
http://www.japparts.nl/index.php?mai...0a&language=en
Check if this bike uses the same carbs:

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