In Walsh's 'The British Musical Miscellany', I, p. 50, nd [1734], is "The Gaberlunzie Man, by James V of Scotland", with a 3/4 tune as in 'Orpheus Caledonius', p. 43, 1725, and I, p. 95, 1733. Walsh reprinted a lot of songs from the 1733 edition of 'Orpheus Caledonius', but the comment about the origin is not in OC.

Somewhat later (but before Herd's publication of "The Jolly Beggar") we find:

X:1
T:The Beggars Meal Pokes. Compos'd by King James the 6th.
S:Oswald's 'Caledonian Pocket Companion', bk. 9, c 1758.
Q:1/4=120
M:C
K:G
G/|(G/A/)(B/c/)dG/G/|G/g/g/g/e3/2d/|g/b/a/g/ (e/d/)e/g/|\
d/B/~A/G/ A3/2::B/|(c/B/)c/d/ee/f/|(g/f/)g/a/{g/}f3/2d/|\
(b/a/)(g/f/) (ef/)g/|d/(B/A/)B/ G3/2:|]

Prof. Child notes, #279, that both "The Jolly Beggar" and "The Gaberlunzie Man" are regularly attributed to King James V of Scotland. (In the 1776 edition of Herd's 'Scots Songs' no attribution is given for either song.) However, Child noted that the earlier published one, "The Gaberlunzie Man", was first given in the 1724 edition of Ramsay's 'Tea Table Miscellany' (the 2 extant copies being at Yale and the Huntington Library and I've seen neither). There is no tune for it in A. Stuart's music for TTM, c 1726. Child adds: 'The tradition as to James Fifth is, perhaps, not much older than the publication in either case, and has no more plausibility than it has authority.'

Both "The Jolly Beggar" and "The Gaberlunzie Man" are probably early 18th century songs deriving from the mid-17th century "The Pollitick Beggar-Man" which is in the Scarce Songs 1 file on my website at www.erols.com/olsonw, or in Child's appendix to #279 if you like want an expurgated version.