Creating simulated human genome files

Does anyone here have experience making simulated genome files?

The ancestry DNA and 23 and me files are just text files with SNPs, so it should be relatively easy to make a simulated genome, in theory.

I'm referring to making simulated genomes for averaging populations or from ancient groups we don't have any actual samples for, like Basal Eurasians, AASI, et al.

Is it feasible to create these, since we already know some modern populations have a known percent composition from these groups?

There are some tools existing for this but I am not certain if these are of any use for this scenario:

https://www.nature.com/articles/nrg.2016.57

https://academic.oup.com/bioinformatics/article/35/21/4442/5497256

https://genomebiology.biomedcentral.com/articles/10.1186/s13059-021-02265-7