The Redfield-Wilton poll also gives 12% who don't know. The most recent YouGov Poll (12-13 March) gives 18% 'Don't know' and 12% would not vote, which, together, gives as many as Labour (also 3% refused to answer).
It is this uncertainty, more uncertain than 1992 (only two real runners). I don't expect that it may result in civil disobedience, but I can see there being surprise as a result.
Reform will rely heavily on Tice-Farage-Anderson. I've looked at local constituencies, many candidates have not been chosen yet Although neither have they all for established parties, they have the local infrastructure. Even where they have been, they don't seem to singing from the same hymn sheet - one is campaigning against using agricultural land for farming, I go to another and it is all about immigration, another is making the area, the county and the country Great Again. Others just give a CV. I am not seeing a core message.
The LibDems did well in 2010 because they had some quite well known figures (in their locality at least) - including Norman Baker, Alan Beith, Malcolm Bruce, Vince Cable, Tim Farron, Simon Hughes, Chris Huhne, Charles Kennedy, Jo Swinson, Sarah Teather, Steve Webb. Now they are, as you say, working on a small number of constituencies but they have laid the groundwork, maybe they have active councillors or the prospective MP has been working the constituency for some time. Reform probably has neither. If they have councillors, they will probably be former Conservatives, not a strong selling point.