Was trying to remember the program I used 30 years ago to run win 3.0 on an xt.
Found it last night in my archives.
Memsim32 uses a file on your hardrive to simulate lim 3.2 expanded memory.
You can find it with an ftp search so I won't bother uploading.
memsim32.08x is for xt 8086/8088/v20
memsim32.286 is for the 286 that already has extended memory.