Adjunct MCU recommendations

I need to add an MCU to an Asterisk environment to handle video conference situations that include legacy SIP video clients.

I am aware of Freeswitch as one option. Can anyone recommend others?

Might an additional new Asterisk instance or two be sufficient to meet your MCU requirements ?

Something like Cyber Mega Phone 2000 could work for you ?

https://blogs.asterisk.org/2017/09/20/asterisk-15-multi-stream-media-sfu/

We would love it if Asterisk could serve this role, but unfortunately it’s not an MCU. We need the server-side video multiplexing / mixing.