Yes, that is great.
I did that with the britons. I grabbed all my units and walked to italy. I captured Segesta and from then on I had to fight at least one full stack of either Juli, bruti, scipi, SPQR or gaul every turn. I couldn`t reinforce my initial army, because I had absolutely no money. The region around arretium was littered with heroic victory sings.
I was hanging by athread ar more than one occasion, but it was the most intense game I had so far.
Btw, when I had like 8 Provinces, and gaul was completely untouched I got the message that egypt was about to win the game. However, they seemed to be unable to reach the goal within the next 50 turns, so I still won.
My first attempt in that direction was to relocate spain to italy, but that didn`t work at all. Spains starting troops are no match for roman infantery.

In my next game, I will try to relocate either carthage or spain to egypt.