The XP2's OVF split-screen ERF implimentation is significantly better than the X100T's.
Until the XP2, the OVF split-screen focusing mode rarely seemed as useful as focus peaking. I never use it in the X100T.
Using the focus ring on XF lenses, I find the XP2 ERF is useful for critical OVF manual focusing. The system is very responsive and the OVF full-screen, zoomed, split-screen view is fast. The simulated split-image shift range is perfect. With adapted lenses display lag shouldnot be an issue. I do not use adapted lenses so I can't test ERF split-screen focusing with stopped-down apertures. For adapted lenses I don't know if the split-image movement range would be similar for all focal lengths. Still, I think the ERF split-screen would be a viable solution with adapted lenses. The least useful scenario will be in very low light since the split-screen EVF will be noisy. A less common issue will be ERF image flicker when the focus region is lit by frequency-modulated light sources (fluorescent and, or some LEDs).
Based on using XF lenses with the focus-by-wire manual focusing, I believe the ERF with focus peaking is also practical. The XP2 implementation is the best of all the X-Series cameras I've owned. Using AF or MF, with mirrorless cameras, focus-region contrast is important for CDAF and PDAF (more so for the former). The only time the OVF-ERF focus peaking would fail is with low-light, low-contrast focus regions.
Since you already have a A6300, the similarities of the two cameras' sensor performance (dual-gain ISO) mean the Techart Pro M adapter must be considered. I've never used the that system, so I'm assuming the Techart Pro is a robust solution.