DDJ- RB Question about operation

Hi,

So I have been thinking for a while that I would like to get a small controller to take with me on my travels, that would allow me to put down some mixes while I'm at work, either in hotel rooms, or elsewhere.  The DDJ-RB looks like it would fill that role quite well, so long as I can fit it in my carry on.

However, I have also been thinking of expanding my current home set-up a bit too, and was hoping that the RB would also fill this requirement.

So I currently have a pair of 1210's, a pair of NI F1's, and an Allen & Heath DB4 mixer.  At first, I was using the 1210's with Traktor Scratch, using the DB4 soundcard as the interface.  But I have been a bit lax with that, and have moved to mixing with STEMS recently, so having all the tracks sync'd.  And I use the MIDI mode on my DB4 for transport controls.

Now, as far as Traktor is concerned, I'm pretty sure I could map out the RB for browsing and transport controls, and keep mixing externally with my DB4.

However, I might like to switch to Rekordbox DJ.  So I guess my real question here is with RB DJ, could I use the functionality of the DDJ-RB, but with my external mixer?  Would I also then be able to MIDI map my F1's to some functions within RBDJ?

And if I wanted to use RB's DVS add-on, would that be possible using the DB4's soundcard?  With the DDJ-RB being employed for browsing and hotcues and the like?

I am aware that something like the XDJ-1000 or similar might be a better thing for what I really want to do with my home set-up.  But I am at a loss as to how to justify £2k for players, when a £200 controller might actually just do what I'm needing.

For reference, I did have a CDJ/DJM 350 set-up a few years ago, but they felt too much like "toys".  Expensive ones at that.  So sold them while they were still worth something, with a view to buying CDJ900's instead.  But I just can't seem to justify them.  I did consider a NI X1 for my transport functions, but the DDJ-RB would be better as it has jogs and stuff, is only slightly more expensive, and comes with Rekordbox, as well as has a better workflow for my travelling requirement.

So will the RB do all I want?  Or at least some / most of it (I don't really expect RB DVS to work with my set-up).