[Phanx]

This works, and also lets you make any other aesthetic changes you want to Macaroon's buttons in the same place:

MacaroonCustom.toc

## Interface: 40200
## Dependencies: Macaroon

MacaroonCustom.lua

MacaroonCustom.lua

local Macaroon_SkinBar = Macaroon.SkinBar
Macaroon.SkinBar = function(bar, parent)
	Macaroon_SkinBar(bar, parent)
	if bar.config.buttonList then
		for _, btnIDList in pairs(bar.config.buttonList) do
			for btnID in btnIDList:gmatch("[^;]+") do
				local button = _G[bar.btnType .. btnID]
				if button then
					button.hotkey:SetFont("Interface\\AddOns\\Stuf\\media\\font1.ttf", 8, "OUTLINE, MONOCHROME")
					-- you can also change button.count and/or button.macroname
				end
			end
		end
	end
end

As a side note, font (or other file) paths begin with just "Interface", not "\\Interface".