For the last 2 years, roudhly in Sept / Oct Sunbeam has run a promotion giving away the 0480 grinder with the EM6910. It is "by redemption" and from what we have seen on here, takes several weeks (or more) to get the grinder.
I really dont think it would be worth the wait (waiting for a promotion that may or may not happen and then waiting for the grinder), think of all the great coffee you could be making between now and the time you get it all sorted.
As for pre-grinding your coffee, no, just, no.
I cant remember if your Roma is breathing or not, but, as a possible upgrade path -
New grinder (EM0480 as absolute minimum), perhaps a Iberital Challenge, Kompak K3 or Rocky.
Unpressurised basket for your Roma.
These 3 things will bring new lease of life to your home espresso, you can then save towards a machine, that could be the 6910 or you might set your sights (and budget) a bit higher.