Force Client-SSL Profile to X25519, Instead of Post-Quantum Cryptography

There is a TLS implementation that was working perfectly before, even though, there is SSL ClientHello extension addition, by a middle-box device. 

With Clienthello packets of 540bytes, this worked perfectly.   An example is the "Extension Unknown Type 17516" added there.

Recent tests show the extension addition is no longer working. The only significant change is that CLIENTSSL HELLO packets are now fragmented on TLS 1.3 with the Post-Quantum Cryptography implementation on clients (browsers), with CLIENTSSL HELLO now regularly abover 1500 bytes causing fragmentation.  

How is it possible if F5 is Client-side server to force all clients to use X25519 ciphers instead of X25519Kyber512Draft00 and X25519Kyber768Draft00 to ensure that full flow is not broken. is there any changes on CLIENTSSL Profile to implement this.                                                                                                       Traffic Flow is Mobile browser--Mobile Packet gateway (header enrichment)-- F5 (Server)