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The issue with the border is really whether some other WTO nation complains that we're giving Eire/EU favourable treatment.
BBC article upthread suggested that exemptions are possible for instances of National Security - presumably intended to allow much harder borders than WTO normal - and that it could be argued that maintaining the GFA is a National Security issue so could defend a non WTO border between NI/RoI
The solution there seems to be to just ignore the border. The issue with the border is really whether some other WTO nation complains that we're giving Eire/EU favourable treatment. That would take a while to resolve so would give further opportunity to actually find a solution.