Multiple Questions... Win7 installs and upgrades

I know that 7 doesn't support secure boot. Will switching secure boot/tpm and CSM on and off corrupt boot sectors (or) drives? If I install 7 on a GPT partition and then turn off CSM and turn on Secure Boot and TPM to install 10 and/or 11 on different partitions or drives, will I still be able to turn them off and boot back to 7 or 7 and a 10 dual boot? Or will the bootloader be destroyed? Right now I'm booting 7 and 10, but I just installed 7 on a different drive and did an upgrade on that one this week. They were installed with CSM. I think I might leave them and put another 7 on a drive, update to 10, then reinstall 10 with secure boot and tpm and update to 11.
Or would best bet be to reinstall 7 on ntsf and then 10 and 11 dual boot with secure boot? I have no desire to encrypt, but I am banking on the bypass hacks not working at some point in time. And it doesn't take much time to save/load bios settings. I really have no desire to move from 7, but not fond of linux and at some point in time 7 will not be supported by new browsers/software, and I'll definitely be to old to learn new systems then.

Yeah I know about 7 without CSM, but I would still have to disable secure boot so its a moot point. Would boot sections become corrupt doin this. Or would other installers try to "fix" my 7 install?
Edit: Ok, think Ill give it a shot. Getting late and I misread you answer initially.