The answer to indoor riding...

So, raising the handlebars on the indoor bike didn’t work because they were already at max height.
But…

BUT…

This worked:

I’m not sure why I thought about it, but I checked Amazon for bike risers and this popped up. And damned if it didn’t work. With the bike level, it feels far less cramped and I’ll be able to keep it for indoor cycling for the time being.

Hell, probably for a long time. I’ll still want a smart trainer at some point, but this will do until I’m ready for that.