Your best bet might be to look at credit transfer with the OU and completing your degree there, since a) part-time funding is a separate "pot" from full time funding, except in the case of ELQ and b) even if the ELQ rules do apply to you the credit transfer should hopefully allow you to complete just the final year of your course. Also OU study is always classified as part-time regardless of intensity, so you could study at full time intensity (i.e. 120 credits in a year) and still be classified as part time for fee purposes as above. Of course, the major caveat is that you don't get a maintenance loan with the OU, so you would need to look at working or living with your family if you are able.
Otherwise you could look at part-time degree options elsewhere at brick unis, and see if you are eligible for funding for those due to the separate pot of funding for PT courses. If you are then it would be clear that it's not the ELQ issue which is a barrier to funding, it's the number of years of prior funding in full time study. In that case you could do a full degree in part-time mode and be fully funded (with tuition fee and, provided it is an in-person course, maintenance loan). Bear in mind though maintenance loans are pro-rata'd for part time study, so you wouldn't get as much as you are getting now (but you will have more time to look for part time work to support yourself through the degree). Outside of the OU part-time study intensity is designated as any that is 75% or less of full time study, so you could get the degree potentially only in a year or two more than you would full time (and if you are quite proactive, maybe even get a good amount of part-time work experience in your career sector).