A word to describe an excessively formal process or procedure

I'm looking for a single word which can describe that a given process is overly formal in a sense that it requires plenty of steps or involves myriad subprocesses.

For instance, some company is about to introduce a new development methodology and employees complain that this methodology is ???, and therefore it would be tiresome to follow because it has many phases.

The word ceremonial, in my own opinion, has a religious connotation. Another option is to merely use such adjectives as overly, exceedingly and very in order to emphasize this fact, but nonetheless it would be great if there exists a single word.

... employees complain that this methodology is byzantine!

byzantine OED adj. often not capitalized M-Webster

Reminiscent of the manner, style, or spirit of Byzantine politics; intricate, complicated; inflexible, rigid, unyielding.

Also as in:

Another problem facing the technology companies is the Byzantine nature of today’s online advertising. WSJ Feb 17, 2018

Byzantium (now Istanbul) was filled with mystics, wars, and political infighting-and the word Byzantine became synonymous with anything characteristic of the city or empire, from architecture to intrigue.

In almost all cultures and countries on this planet, what you're describing would simply be called bureaucracy and a process that involves a lot of bureaucracy would be referred to as a bureaucratic process. Here's one of the several definitions of this term from the Cambridge Dictionary:

complicated rules, processes, and written work that make it hard to get something done

Example sentence (taken from the English Oxford Living Dictionaries):

More than 3,600 staff will be given the chance to influence the way the trust is run by pointing out the unnecessary rules, paperwork and bureaucracy which slow them down.

By the way, the corresponding idiomatic term for bureaucracy would be red tape. And believe it or not, it can be a single word if you properly hyphenate it and use it as an adjective: red-tape procedures. Here's what they say about this expression on Wikipedia:

Red tape is an idiom that refers to excessive regulation or rigid conformity to formal rules that is considered redundant or bureaucratic and hinders or prevents action or decision-making. It is usually applied to governments, corporations, and other large organizations.

labyrinthine

Oxford Living Dictionaries gives the following definition:

1 (of a network) like a labyrinth; irregular and twisting.

‘labyrinthine streets and alleys’

1.1 (of a system) intricate and confusing.

‘labyrinthine plots and counterplots’

‘In the process, he unravelled the labyrinthine means by which a painting bought by war profiteers and sold to German army looters found its way into the cultural heart of Britain.’

‘For a show that has the labyrinthine, seemingly nonsensical plots of a soap opera, that's a real accomplishment.’

‘The country's legendary bureaucracy is as labyrinthine as ever, and its legal system opaque, with separate laws for foreign and domestic investors.’

‘The labyrinthine diplomacy and politics of the Italian wars are the real subject of this painstaking book about what Jem meant to others.’

...

Labyrinthine, through its maze analogy, suggests unnecessary complexity and a process that could be made much more simple.

'Convoluted' might be the word you're looking for. Described by Google as:

(especially of an argument, story, or sentence) extremely complex and difficult to follow.

An example of usage:

"the film is let down by a convoluted plot in which nothing really happens"