First question to decide - do you need all of these approvers to be able to review and complete the form/approval at the same time or is it acceptable to only do one at a time?
If they all need to do it simultaneously, then you're likely going to want an Inclusive Gateway with a path evaluating each possible option on your form and leading to a user task. This means that multiple user tasks are active simultaneously. Your Process Diagram looks pretty complex this way, but the actual decisions are fairly simple to set-up, just one decision for each path out of the Inclusive Gateway based on one value each on your form.
If they can take turns, then you can make your Process Diagram look simplier, and the complexity is shifted into the filter being evaluated on the user task. In this case, you keep assigning the user task back to the team. After submission, it hits an Exclusive Gateway that checks if all approvals are complete, and if not it follows a path back to the user task, in this way ensuring it keeps going back to the team until all required approvals are complete. The complexity is in that decision for the gateway and the filter on the task. This will definitely be pushing up towards the 1,000 character limit of the filter field, so I usually keep variable names short and minimize use of white space when writing Javascript for filters (they're less readable, but I've hit that 1,000 character limit on a few occassions).
Here's an example of the latter one that I use on a form. In this form, I have several fields that run a calculation to determine the percent complete of each section. There is also a total complete percent field. The Exclusive Gateway that evaluates whether or not to return to the user task or proceed towards finalization is just looking at that total percent complete field, and if it is anything less than 100% complete, it sends back to the user task, so its decision is fairly simple. But when we get to the user task, it needs to decide who to assign to based on the percent complete of each section. This filter looks at the field for each section to see if it is less than 100% and includes the Role for that section if it is less. There is an assigned user on the form that is always included (the dpoc variable), so eventually it works its way down to only that one user is assigned. In this code, you see that there are variables for each section that start empty and only get populated with the users in a particular role if their section was less than 100% complete. At the end it combines all of the assignments into a single result. This has been working great for many years, since version 10.2.
var doc = '';
var bo = '';
var ap = '';
var sec = '';
var sr = '';
var dpoc = team.findTeamMembersByUserName($util.getValue('dpoc_username'));
if ($util.getValue('percent_complete_documents') < 100) { doc = team.findMembersByRole('Documents Review'); }
if ($util.getValue('percent_complete_backoffice') < 100) { bo = team.findMembersByRole('Back-Office Review'); }
if ($util.getValue('percent_complete_assetprotection') < 100) { ap = team.findMembersByRole('Collections Review'); }
if ($util.getValue('percent_complete_securian') < 100) { sec = team.findMembersByRole('Securian Review'); }
if ($util.getValue('percent_complete_specialreview') < 100) { sr = team.findMembersByRole('Specialty Review Team'); }
$result=$util.union(dpoc, doc, bo, ap, sec, sr);
The same kind of logic should work for your form, start with empty variables, and populate them if the appropriate fields on the form are marked, and they do not show complete. My only worry is with up to 10 possibilities, you are really gunna be pushing towards that 1,000 character limit, and might need to get a bit creative.