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There are no current plans to try to work around the various problems with vB5, as it's a dead platform as far as mod development goes. For proof of this, you need look no further than vB.org: https://vbulletin.org/forum/forumdisplay.php?f=198
vB5 mods were beginning to be released in September of 2012, and since then a grand total of 93 mods have been released. 93 mods in 6 years is as close to a dead platform as you get.
If you're interested in customising your forum, I would strongly recommend switching to XenForo 2 instead. If you were to make that switch, I would be happy to exchange your vB5 vBShout license for XF2 product licenses of an equivalent value.