Trying to find fillet to work with a frame ...

[CAframer]

My client wants to use Designer W90-456, with stacked liners, and a fillet between the liner stack as in the example below.

I'm having difficulty finding a fillet that works well with this frame moulding. So far the best (i.e. least worst) option I've found is Larson's 150540 from the Sevilla range.

Would appreciate alternative suggestions

 

[Baer Charlton]

Flexible Fillet between the two fabric wrapped liners would be the least jarring and most pleasing visually.