Saster

I don't think you can use Types to do what you want - not easily anyway as this is a fundamental setup parameter

I don't have a centre, but like you I prefer Trifield to Stereo or Direct. I think even with 2 front speakers, the sound stage is more open and defined.

Suggest you start saving your pennies for a better centre speaker, or put your existing speaker in the cupboard.

Cliff

Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.