1 possible solution... if you have the space & resources for doing so... would be to set up in your Win 11 tower, a setup of HD's that can be then used to house either Win 10, 7 or even back it down to XP... if there are still valid resources around to take it back, even that far...
that are safe to insource from.
Either that, or if your primary HD is big enough... have it house 11 & 1 of those other pre-11 op sys's on it... use the older op sys to run the older games on & thereby utilizing the Win 11, for more... modern stuff... & or games.
That, or just find a tower that already has Win 10 or older op sys already installed & shift your older games over to that...
Hope this helps...
M. M.