Yes, an ALEPH can be build using P Channel mosfets. At least
I do not see to much problems.
To illustrate this I made an example schematic of an ALEPH 3
with P Channel IRFP9140. As you can see you need to change
the input stage a little. (i.e. use n-channel IRF610).
I simulated this circuit, and it behaves very similar to the
original ALEPH 3.