Been pondering how this might be done using MEG such as to represent (as close as possible) the deployment of knights behind a friendly spear or spear/xbow mixed screen as opposed to the more classical ancients deployments with cavalry wings on the flanks. Given that interpenetration is not possible, other than where SUGs are involved etc., the main difficulty I could see would be the cavalry getting stuck behind the infantry lines if it's not played very carefully.
One option I suppose would be a solid line with foot alternating with cavalry or in whatever combination one wanted so:
F C F C F C F
Has the advantage of there being no exposed flanks within the line and the cavalry being able to get out from the infantry lines but command and control could be an issue with care needing to be taken that all the cavalry are in command range so that they move when you need. It would also likely be a very long battle line.
As far as I can see, that's about the only option, other than say a variant of it with the cavalry stepped back from the infantry such that they form a ZOC protecting the otherwise exposed flanks of the infantry but are still able to get out and won't be contacted if the infantry are. It's still a very long line though.
F F F F
C C C
Still reading through the rules as it's been maybe 2 years since we played last so it's almost like starting afresh. Meanwhile I'm trying to think if I've missed any other ways of doing it, such as a long line of infantry with maybe two centre UGs contracting or otherwise getting out of the way to let cavalry pass. Each time I ponder tactics like that though I just think of how quickly troops, especially cavalry, can actually get into contact, maybe two turns max, such that I think any manoeuvres like that would be way to time (and card!) consuming to pull off before the enemy was on you.
Well, I was wondering myself how to do that, but last time a French army tried that it didn't end well for the Genoese...
I think it might be possible with a combination of expansions / contractions but, while I haven't sat down and worked it through, I think it would take take way too many orders and way too much time and you really couldn't afford to be pulling blacks in any numbers at all across all the generals I think.