But main obstacle for Baltics would be getting over smuggling bux they recieve when Belarus tries to smuggle tobacco without tariffs. Either Belarus or Balts would have to crack down on this industry, because it makes sense only if it's imported to Europe illegally. And since our current authorities directly benefit from vice industries, i just don't see it happening on our side.
If it were to Balts for shut it down completely, relationships would become even colder, and maybe even some corrupt bureaucrats inside would be displeased as a result.
There's also a question of aiding war effort for Ukraine, all other partners must have high incentives to aid in a meaningful way, that right now doesn't look like anyone's business.
Also question on how to fix quality of living and wages across those places to prevent massive internal immigration between partners. While i personally would move to Lithuania at any possible moment, i love my home, and don't see it as good idea for any of participants, because of spike in competition, fall of wages in Lithuania, and poverty trap for everyone else.