Timed call routing

[HUSSAINQCS]

I have hotel OXE connected with Avaya in other hotel

Scenario :
Oxe (Any user )
Oxe (3542) —which is in hunt group
Avaya (17542)

When oxe user calls to 3542 from
Morning 6 PM 8 AM call have to get auto transfer to Avaya ext 17542

Also from 5.59 PM to 8.01 AM if any oxe user tries to reach 3542 after no answer of 4 consecutive rings the call should get forward to Operator (0)- Avaya operator

I have configured Avaya operator as network number in oxe also configured 17542 as speed dial number in oxe

The problem is that I cannot change hunt group where the extension 3542 was added because it’s already configured with 28T as prefix in all guest analog phone keys

[HUSSAINQCS]

How can I achieve the above scenario ?