Suggesting research topic of personal interest to my PI
There is a possible downside to your plan that you should also consider along with the discussion with your advisor.
Undergraduate research, unlike doctoral or professional research, is usually time limited. Therefore a long term research project may be contraindicated unless your advisor agrees that partial results are acceptable within your time frame. You might not be able to reach the point of having publishable results. If that is OK, then there are no real issues.
And if it is OK, and leaves you in a place with unfinished but potentially finighable work, then there might be an advantage to it. If the research questions are sufficiently &quot;interesting&quot; and your approach is &quot;promising&quot; then you might have a head start in graduate study, depending on the requirements of any program you enter.
But, before you commit much time and effort, have that conversation with the advisor and be sure that your short term outcomes are good enough to allow you to continue.