I personally support you guys.
I believe ALPA policy is to support other unionized groups in time of need. I'm sure there are exceptions, but I think that is generally the plan. A union is about both the membership and the leadership. Each has a role to play in support. I have heard our leadership supports you too. I hope when you guys need our support the most, you have it.
I don't know what ALPA can do, legally, to support your unionization effort. Good ALPA members support you. As you know, not all pilots are good union members.