This thread is so cool!
How did the seed formation go? Even If they spontaneously aborted, the pre aborted embryos have some useful potential for embryo rescue and embryogenesis.
This interspecific hybridization technique is a common one for the production of double haploid plants in other plant species bc it’s the incompatibility of the genes being the reason they abort and on the flip side their shared ancestors that allow the pollen tubes to begin the fertilisation process.
If you ‘rescue’ i.e. harvest the pre aborted seed and put it into a growth medium it should in theory be possible to propagate plants that only contain the genetics of the mother, a haploid plant, this is then gene doubled to give you a double haploid and completely homozygous plant, without needing to go to F12 or whatever.
It’s like one of the holy grails of plant breeding/improvement, y’all may not fully realise it but these experiments are groundbreaking stuff!