Might want to keep a couple of things in mind in looking for a non -ilf riser that accepts both recurve and longbow limbs. Generally, a riser is designed more for one than the other. Risers designed primary for recurve limbs, for example, often have a larger limb pad angle coming off the bow, creating more reflex coming off the riser.
If optimized for recurve limbs, longbow limbs will lose some of their efficiency by comparison.
Likewise, risers designed mainly for longbow limbs have smaller limb pad angle such that the limbs have less deflex as they're coming off the riser. That pad angle might push recurve limbs too far forward, increasing the pre/early load, and potentially contributing to early stacking.
Then, too, risers designed for recurves are generally wider because recurve limbs are generally wider than longbow limbs. The solution has been to make the longbow limbs wider ( a lot of hybrid limbs are made that way), or conversely, to make the recurve limbs narrower for risers that are initially designed to accept longbow limbs. Visually, some of these combinations can sometimes be less than attractive.
I have a couple of Morrison Shawnees (better suited to longbow than recurve limbs IMO). I prefer the longbow/hybrid limbs, but the recurve limbs look and perform very well on them.