This can be done and I've done it myself, but keep in mind that if it is much lighter than the spring your replacing the trigger can cease to function as designed and become unsafe.
Your probably better off getting a spring from a place like Brownell's whom sells springs designed to be used in guns than using a super light pen spring. Sometimes it's better to stretch an existing spring and then cut a little off it than replace it with a much softer spring.
For example Erik Brooks whom sells aftermarket items for the CZ rimfire rifles sells a trigger kit that consists of a brass roller and a set of four springs for the CZ 452 trigger. The heaviest spring in his kit reduced the trigger pull on my 452 to 1.5 pounds. This would be unsafe for many guns and though a pen spring could be used it would have much less tension and make the trigger completely unsafe.
One of the testing things I do when working on a trigger is to bounce the butt of the gun on the floor with the firing mechanism cocked and a dummy round in the chamber to take up firing pin impact. If the trigger will release when this is done or when the safety is taken from safe to fire then the spring is to light and the trigger is unsafe.
My 2 cents.
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