In fact, I have much more difficulty finding any Haplogroup I subclades that seem to share an early spread into Europe with early proto-R1b-L11 than I do those that don't. Even the I2 common in the Balkans (I2a-Din) doesn't seem to have spread from there. So my thought is that R1b passed through the Balkans long after Haplogroup I did, and that the Halpogroup I expansions that connected with R1b expansions happened after R1b had already drifted into the local Haplogroup I-carrying areas.
Let me suggest that R1b-M269 entered Europe from multiple locations and times, so any correlation between I-M170 would probably be with clades of R-U106/S21 and it may not be a clean correlation given the sparse settlements of the North Sea and Scandinavia.
I 'would not' expect to see any correlation at the level of R-L21.
Even though its very likely M170 was seeping into Europe as a minority haplotype with LBK or FBK, I would guess that the majority of LBK and FBK paternal lines in Western Europe were culled starting in the Chalcolithic/Early Bronze Age.
I find the Urnfield an interesting topic for "I" followers in that it begins in what could only be SE Europe and ends with Jastorf, among others. Of course the majority of the human population in the Urnfield horizon were descended from Tumulus people, but there seems to be an introduction of a new social order and cultural traits associated with the SE.
Emphasis on a type of cremation burial, axes, so forth. The evidence of "hill forts" I think is indicitive of an embattled social caste or at least the presence of a non-native aristocracy.
If in fact Urnfield involved a warrior caste of SE Indo-Europeans, there would certainly be an amalgam of men that had high diversity of Haplotype I and probably low diversity of R1b. So it would seem at least a substantial amount of I's distribution in Europe could be attributed to Urnfield and its high frequency and variability in the North is deceptive because of density and from where it spread.
The Urnfield began its expansion around the time of the Brnoze Age collapse, which was especially violent in the Aegean and Balkans. Increasing violence of Scythians pushed Cimmerians, Thracians and Phrygians from their native abodes into places like the Balkans which may have either pushed Balkan refugees into Europe or maybe the entire episode turned into one big land grab with every nation for himself, Balkanites included.
It's in this environment that appears to be the ideal primordial ooze that a language like pre-proto-Germanic to have evolved.
Perhaps the so-called "Thraco-Cimmerian Hypothesis" could be better explained by a maintenance of Cultural contact with the Balkans during the Urnfield phase ultimately ending with the Hallstat phase.
Looking at maps of the following I-M170 and comparing with R1b-S21 and later migration period, I do see some correlation, of course it could be in part due to the geographic overlap of FBK.
I-M438/I-M253
(M253 being young enough that it was essentially born in the North shortly after its Urnfield expansion)
I-M436 (Urnfield derived, later Germanic spread)
I-M423 (may have been too young during Urnfield expansion from Balkans and the reason why its frequency is low in Europe)
I-M26 (Urnfield derived, later Germanic spread)