Actually, it is not a substitute at all, tramming is both a useful skill to have, and a 'good' thing for the mill head to be.@trevj We agree 100% on the second point, which I tried to make above.
However, on the first point we must differ. Firstly, the head does not have a ram, so you could use a 2" face mill and still not reach the corners and ends of the table. This is why it HAS to be fly cut. it will need around a 4-5" swing on the fly cutter to reach the corners of the table. That was what I measured when rotating my head with my version of this mill. With a 4" fly cutter you have to take care for the tram, which isn't hard, and is good practice anyways, perhaps even 'best practice'. The step over idea is a great one - but it shouldn't be used as a substitute for tramming your mill.
But it also is a result of the years of experience that come from trying to take parts off the table with the very best surface finishes possible, which, sometimes, is recognizing that in one direction of feed, over the others, you get a superior finish, and being ever so slightly OUT of tram, can actually become a useful contributor to that.
Just another tool in the toolbox!
In all honesty, I like my last suggestion best, just cover it so you cannot see it! Otherwise, either find a large mill (to use), or a new one (to replace the chunked up one!).