Coming back from consulting into Tech is generally not a super tough transition as long your skills are still reasonably sharp. For me I spent years consulting and as a founder (U.S. based). Good consultants learn business and people skills which are critical to succeed that generally a senior developer won't have.

So my guess is your key skill that so many very good engineers lack is the ability for you to work with the business, understand the business needs and translate that into technical product vision and priorities. This set of skills are very underrated in most small companies and startups overall, yet it is the one thing that can really have a solid and positive impact on all companies. In my opinion if you want to move back into a tech based company and out of financial services you should focus on those skills as your sales point. Your tech skills could be less than others, but if you can turn business needs into tech vision and priorities that is more valuable.

Not sure what the Sydney or other markets you mentioned are like, so your mileage may vary.