The best thing that can happen to UKIP is that it aborbs the other so-called “Far” Right parties. That means offering an olive branch to TR, and changing the house rules to facilitate that if need be.
In my neighborhood, this rather hard looking lass stood for a seat with UKIP’s Mark Reckless winning it on his by-election.
She ended up getting a third of the votes that the Monster Raving Loony candidate polled.
I would argue that any current “Far Right” voters wasting their votes on these parties that really ARE that way inclined - would be better to swing behind UKIP in the future.