Surrogate character to visualize a space like ̺ this, but without combining?

Question

I'm looking for a character in Unicode like this (in black):

The problem with COM­BI­NING INVERTED BRID­GE BELOW (code point U+033A, \xCC\xBA in UTF-8) is that it must be combined with another character. I need the character stand-alone.

Combined with a space:   ̺  (easily lost if you try to delete the character to its left-hand side)

First letter of word, non-spacing bridge, rest:   ̺Not ̺what ̺I ̺want (N̺ot ...)

Is there such a character, a non-combining, spacing inverted bridge below?

Answer 1

To quote an answer by Ben to How can I best display a blank space character?, these two underbracket characters are possibilities:

• “Open Box” (code point U+2423, looks like ‘␣’). This can be entered in HTML as ␣, ␣ and ␣.
• “Bottom Square Bracket” (code point U+23B5, looks like ‘⎵’). This can be entered in HTML as ⎵ and ⎵.

You can see these characters in PDF files on Unicode.org here and here.