Seems like T230 and T235 have different chipsets. I guess can't install this.
Is there any way to modify this for T230? Is it going to be very complicated? I have no experience but I might want to give it a try if it's not going to be too hard.
My K30 Pro Zoom with Poco rom works fine for me with screen protector on. It sometimes misread but that's not very common. Yes it seems a bit slower than the back fingerprint but I don't really mind that much as it's not that much of a difference.
These three negatives are the largest turn off for me. Especially the MediaTek CPU. It makes installing roms and updates a nightmare from personal experience. Definitely not going switch because of just a bit better screen and speaker.
I waited a week to unlock the phone. After that I just download a flashable rom, extract it and run the "flash_all.bat". Only after that I install twrp. You probably could flash twrp first and then flash the zip.