Win10 is EOL in late 2025. I didn't try Win11 yet.
If You need BigSur or higher for some special App/task, then a single Win10-installation is not an option.
I'd not recommend to install macOS and Win10 onto a single drive, since the drive requires to be converted to hybrid-mode with mixed GPT/MBPR-partition-scheme (GPT for macOS and MBR for Win10). Add OCLP to that mix, and sooner or later you might end up in a hassle.
Like with
@iModFrenzy 's dream machine of thread
#11 I'd swap the optical drive for a second SSD if You consider a dual-boot machine with Win10 and macOS.
But bear in mind, that, as he said, Windows must be installed onto the drive sitting in the HDD-bay to be bootable (while macOS or Linux can be booted from both positions: HDD-bay or optical-bay).
And check the speed of the SATA-connections of your MBP first
(Apple-menu/About this Mac/SystemInformation/SATA): the HHD-bay will certainly run at 6Gb/s, but the optical drive might be limited to 3Gb/s, which means, that the transfer-rates of macOS running from the position of the optical drive are cut half. That might make performance of OCLP Monterey even worse. (The mid2012 15" MBP9,1 has 6Gb/s-SATA3 ad both ports, so hopefully Your 2011 MBP too ...)
If you have spare place on a future SSD, You might install a backup-system at the very end of the SSD. For that purpose You'll have to create 3 (or 4) real partitions (all APFS) in the right order:
P1a: OCPL-Ventura; (P1b: Data); P2(60GB): Patched_Mojave(also for 32bit-support); P3(16GB): patched Mojave-Installer
(Mind the right order: P2 can be removed and fused with P1, but not with P3; P3 can be removed and fused with P2, but not with P1.)