'Is there a way to set a "new" parameter, internally to a template or other page?

Let's say I have some page which can take two parameters, x and y. I often find myself doing things in that page like in this silly little example:

{{#if: {{{x|{{{y|}}}}}} | '''{{{x|{{{y|}}}}}}'''. I repeat, {{{x|{{{y|}}}}}}.}}

In many cases, I would greatly prefer to simplify the reuse of {{{x|{{{y|}}}}}}, for clarity, for ease of typing, and for making it more difficult to miss or to screw up. So, I'd like to do something like the following hypothetical syntax:

{{#set:z|{{{x|{{{y|}}}}}}}}
{{#if: {{{z|}}} | '''{{{z}}}'''. I repeat, {{{z}}}.}}

That is, make a new parameter, z, which was not passed to the page, but nonetheless can be used in the page. Is there a way to do something like this?

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