The legality of proxies is not a gray area.
If you take one card and turn it into another card, it is the legal definition of counterfeiting.
Example: I take a foil Jhessian Lookout, de-ink it, and make it into a Liliana of the Veil proxy. I will be trading/selling it as something it is not.
There are methods of making proxies that involve cutting away the name and cost bar at the top, leaving that exposed and original, which is legal. Zeerbe does some excellent work on these and I haven't tried it myself yet.
I can't trade you custom foils, and I'm sorry to hear that you don't live near a place that can print things for you. I would suggest you prepare your cards, nine to a page, and make a special trip somewhere. Make sure you bein a card to check the size of the printing.
I currently live in a mountain town which has no print shop, but at least once a month, we drive down into real cities for cheaper groceries.
If you need a hand with the process, I'm happy to help, though different boards have different rules for discussing the creation of these cards.
I am banned from MTGS for repeated violations of their policy of no discussing the how-to of the physical aspect, but reddit mods got in touch with me over discussion of the digital. I don't know deckbox's policy.