That's looking bazzing Paul. Not sure of the restrictions in the 'States, but in the UK, inland surface mail is allowed to carry items such as paints, varnish etc. I'd guess that if a mail order/on-line outlet lists the product, then they can ship it, and any shipping restrictions will probably be shown.
A little tip for the varnish, which might help a touch, but experiment first.
By adding talcum powder, the viscosity can be changed; a thick mix will provide the equivalent of sanding sealer, which, as the name suggests, is used to seal the grain, and then sanded. This is also used to achieve a perfectly smooth, polished surface when making male moulds from balsa (or other timbers), and in various viscosities, can also be a useful filler for small joints, depressions etc in plastic modelling.
By adding a small amount of talc to gloss varnish, this can produce a 'heavier' varnish similar too, but not exactly the same as dope, and can be used to seal the tissue.
Hope this helps.