How can I inject error inside a sequence class instead of injecting through uvm_callback class functions

UVM
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1

Hi, I have an error injection class where i’m injecting error using callback class function. Below is the code snippet of my class.

class hs_pl_crc_ffff_for_wc_grt_0_error_callback extends svt_my_xmtr_callback;

function new(string name = "hs_pl_crc_ffff_for_wc_grt_0_error_callback");
  super.new(name);
endfunction : new

/** Set the checksum value to 16'hFFFF */
function void packet_cov(svt_my_xmtr xmtr, svt_my_packet xact);
  // This is a virtual function declared inside svt_my_xmtr_callback class.

    xact.checksum = 16'hFFFF; // A field of my data packet.

endfunction

endclass

class hs_pl_crc_ffff_for_wc_grt_0_error extends my_base_test;

  /** Instance for the callback class */
  hs_pl_crc_ffff_for_wc_grt_0_error_callback error_cb;

  virtual function void build_phase(uvm_phase phase);
    super.build_phase(phase);

  // Other configurations are also set here. But not shown.
  uvm_config_db#(uvm_object_wrapper)::set(this, "env.xmtr_agent.sequencer.main_phase", "default_sequence", svt_vc_interleaved_data_sequence::type_id::get());

  add_check_to_demote("checksum_check",1);

  endfunction
    
  /** Function for End of elaboration phase */
  virtual function void end_of_elaboration_phase(uvm_phase phase);
    `uvm_info("end_of_elaboration_phase", "Entered ...", UVM_HIGH)
    error_cb = new("error_cb");
    super.end_of_elaboration_phase(phase);
    svt_my_xmtr_callback_pool::add(env.xmtr_agent.driver,error_cb);
    `uvm_info("end_of_elaboration_phase", "Exited ...", UVM_HIGH) 
  endfunction :end_of_elaboration_phase

endclass

Now I want to inject this error in my sequence class instead of using callback.
Any Idea please…
If anything can be done using pre_body()/post_body() tasks of my sequence, then it would be great.