First off, I already read #444, this is specific to the fact the two mods were using the same ID Name.

Is it possible to detect if immibis LXP is installed and use that for the XP in this mod?

Digging into Immibis code, it appears it has "compatibility" with OB.

This in the form that, it has functions for conversion rates, and their machines accept xpJuice.

I agree, not something expected in any short term, but would be nice on the radar. :)

Just to clarify, in 1.7.10 they are separate fluids with separate names. For second part of request, i.e. fluid substitution - probably not going to happen. Such situations are complicated to balance - I have no idea what other liquid xp is used for and (most importantly) what are conversion rates.