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Unfortunately the XDJ-RX2 does not support DVS functionality, but you could play vinyl as an input source to one of the channels.
Yes, those additional rekordbox dj functions would still be available with the RX2, but you wouldn't necessarily have access to control them (eg. Sequence Call).
Yes, you could use the RMX plus-pack, but the FX are called and controlled through the software; there are no dedicated controls on the RX2 for that purpose.