I love the Font Awesome icon font and want to use it for most of the icons on my site but there are a few custom svg icons that I'd need in addition to what's offered.
I noticed that the .svg version of Font Awesome is composed mostly of these <glyph />
elements:
...
<glyph unicode="" horiz-adv-x="1536" d="M0 80v477q0 51 24.5 61.5t59.5 -24.5l162 -162l340 338l-338 338l-164 -164q-35 -35 -59.5 -25.5t-24.5 60.5v477q0 31 23 57q27 23 57 23h477q51 0 61.5 -24.5t-24.5 -59.5l-160 -158l338 -338l332 334l-162 162q-35 35 -24.5 59.5t61.5 24.5h477q33 0 55 -23 q25 -25 25 -57v-477q0 -51 -24.5 -61.5t-59.5 24.5l-162 162l-334 -334l338 -336l158 160q35 35 59.5 24.5t24.5 -61.5v-477q0 -35 -25 -55q-23 -25 -55 -25h-477q-51 0 -61.5 24.5t24.5 59.5l166 166l-336 336l-340 -340l162 -162q35 -35 24.5 -59.5t-61.5 -24.5h-477 q-31 0 -55 25q-25 20 -25 55z" />
<glyph unicode="" horiz-adv-x="1880" d="M0 852v152q0 18 1 47.5t10 56.5t29.5 46.5t57.5 19.5q-45 29 -71.5 75.5t-26.5 104.5q0 43 16.5 82t46 68.5t68.5 46t82 16.5q45 0 84 -16.5t67.5 -46t46 -68.5t17.5 -82q0 -57 -27.5 -104t-72.5 -76q37 0 57.5 -19.5t29.5 -46.5t11 -56.5t2 -47.5v-152 q-14 -8 -23.5 -18.5t-27.5 -10.5h-328q-16 0 -26.5 10.5t-22.5 18.5zM158 57v387q0 78 45 138.5t98 109.5q10 10 25.5 21.5t33.5 15.5q18 6 41 7t45 5q61 10 130 19.5t135 19.5q-90 57 -144.5 151.5t-54.5 207.5q0 88 34 166.5t92 136t136 91.5t166 34t166 -34t136 -91.5 t92 -136t34 -166.5q0 -113 -54 -207t-145 -152q66 -10 134.5 -19t130.5 -20q23 -4 45 -5t41 -7q18 -4 33.5 -15.5t27.5 -21.5q66 -59 103.5 -116.5t37.5 -131.5v-387q-12 -6 -20 -13t-18.5 -14t-23.5 -14.5t-36 -15.5h-1368q-35 0 -54.5 22.5t-43.5 34.5zM1452 852v152 q0 18 2 47.5t11.5 56.5t30 46.5t56.5 19.5q-45 29 -72.5 75.5t-27.5 104.5q0 43 16.5 82t46 68.5t68.5 46t84 16.5q43 0 82 -16.5t68.5 -46t46 -68.5t16.5 -82q0 -57 -26.5 -104t-71.5 -76q37 0 56.5 -19.5t28.5 -46.5t11 -56.5t2 -47.5v-152q-12 -8 -22.5 -18.5 t-26.5 -10.5h-328q-18 0 -27.5 10.5t-23.5 18.5z" />
<glyph unicode="" horiz-adv-x="1597" d="M0 1137q0 88 34 166.5t92 137t136 92.5t168 34q86 0 166 -33t139 -92q8 -8 21.5 -20.5t26 -25t21.5 -25.5t9 -25q0 -18 -12 -31q-6 -8 -25 -12q-47 -10 -88 -22.5t-86 -31.5q-4 -4 -16 -4t-25.5 10.5t-31 21.5t-42 21.5t-57.5 10.5q-35 0 -66.5 -13.5t-54 -37t-36 -54 t-13.5 -67.5q0 -41 17.5 -75t43 -63.5t56.5 -56.5t57 -53l180 -178q23 -25 54.5 -37t66.5 -12q43 0 73 16t46 16q12 0 39 -21.5t55.5 -49t50 -55t21.5 -42.5q0 -29 -36 -51t-83 -38.5t-94 -26t-72 -9.5q-86 0 -164.5 33t-140.5 92l-303 305q-61 59 -94 139.5t-33 166.5z M578 1010q0 29 35.5 51t82.5 38.5t94 26t72 9.5q86 0 166 -33t139 -92l303 -305q61 -59 94 -139.5t33 -166.5q0 -90 -33.5 -167.5t-92 -136t-137.5 -92.5t-167 -34q-86 0 -165.5 34t-139.5 93q-8 8 -21.5 19.5t-25.5 25t-21.5 26.5t-9.5 26q0 18 13 28q6 8 24 12 q47 10 88 22.5t86 33.5q12 4 17 4q12 0 25.5 -10.5t30.5 -21.5t41 -21.5t58 -10.5q72 0 121 49.5t49 120.5q0 41 -17 76t-44 63.5t-56.5 55.5t-56.5 53l-178 180q-53 49 -123 50q-43 0 -72.5 -17.5t-46.5 -17.5q-12 0 -38.5 21.5t-55 49t-50 56t-21.5 41.5z" />
...
Would it be effective to take my svg icon code, paste it in as a new glyph element and assign an unused unicode char?
Give Icomoon a try. You can upload your own SVGs, add them to the library, then create a custom font combining FontAwesome with your own icons.