If you look at the traditional list of best conservative colleges, few have quality STEM programs.
First, gauge whether your child has the intelligence potential & desire to be successful in STEM.
There is a current fallacy that anyone can be an engineer or scientist if they just had access to [fill in the blank]. In my undergrad days, I saw many students go into engineering because “that’s where the money was”. They did not make it because they either flunked out, or realized engineering was not them. While engineering was male dominated, there were some women engineers and math majors - they all shared an above average mathematical aptitude and interest.
Today for STEM, I would recommend going to community college for 2 years and get all/most the non-STEM electives out of the way. Since students commute to school, sitting around with too much time one’s hands to learn to do drugs and be a leftist is minimized or non-existent. Even today, engineering departments may have some leftist profs (mine had a couple 30 years ago) most if not all of them are interested in how things work, making and breaking stuff and putting it all back together etc. We frustrated one lefty prof who loved to talk politics, but he never held it against us in grading because the subject is quite objective - you can apply Fourier Transform or you cannot. Last advice - get an advanced STEM degree. Many times because one is American, they beg for you to come in. You can get financial support (no debt) for the entire advanced degree.
One more thing. Do not make any contributions as an alumnus. It matters not how great the parties were, or the football team was, or all the women/men you dated, etc. Put that emotion aside. Put your money where your mind is - and it isn’t there.