Magic Spider Filter
To be perfectly honest, the town is not really safer than anywhere else. If anything, it's less safe because of the influence of the Portal. In any case, the biggest dangers come from the subtle platform, the astral plane, which is on a different level altogether.
What is it that you hope to achieve by doing astral projection? I mean, besides the obvious, being able to see again? Is it your hope to make this a regular thing?