manage interceptor for changes

Good morning,

I'm looking for ideas to move forward with my request regarding the changes.

I have to respond to a request which is as follows:

in addition to the 3 normal/urgent/standard changes I must add 3 "secure" changes visible by a role that we will call "secure", the only difference is a new custom field placed on the true boolean.

For urgent and normal no problem: I added two lines to the interceptor linked to a URL, to which I added at the end "^u_custom_field=true"

For standard, it is more delicate because it refers to a list of pre-approved changes. (com.glideapp.servicecatalog_category_view.do?v=1&sysparm_parent="sys_id")

Do you have a solution, so that I can on each of the standard change lines, when I click, I appear on the new change form in question, with the value of "u_custo_field" set to true?

thank you very much in advance