I’ve been using a Sofle split for almost a year, probably in about 30-40% of my typing. Despite tweaking my setup as best I can, I still find the experience difficult.
One issue that seems to have a big effect is that I still think of the position of mouse in my dominant hand and keyboard with my other hand as useful.
I use it often for everything from casual surfing to editing. For example during editing you’re often selecting text with the mouse and doing some minor editing with your other hand. Split keyboards seem to really remove this efficient option since both your hands need to be used most times.
A lot of people who extol the benefits of split keyboards are comparing to traditional keyboards when your tasks are static.
You could try out QMKs swap hands feature. I’ve not tried using myself but have considered doing so for this use case exactly.
+1 for swap hands feature, I have one pinky key on each side with momentary hold and one-shot for hand swapping, I use it mostly in CAD or image editor while using the mouse with my right hand.