2 bartender/day tip share ideas in a cashless bar with overlapping hours

Looking for recommended fair tip share recommendation.

The cashless part makes it difficult as the admin has to split and divide all tips on the back end.

As of now there is one bartender basically 10 am until 7 and another from 3-9. The bar shift overlaps from 3-7 with two bartenders for the dinner rush. If it's slow the overlap is minimal. If busy it could be longer - and the closing bartender may end up staying longer or opening bartender leaving earlier.

As we get busier the night bartender will be staying longer as the hours extend.

There is no cash and we ring all tabs under our own numbers but we work as a team and take care of all guests equally.

Seems the best way would be to each keep our own tips during the hours we work alone and split equally the tabs that we share working together.

But I don't think management would be happy to do that math - figuring out what hours were solo and what hours were overlapped and then split up the tabs that were accrued during the split shift.

Additionally how do you split up the server tip outs to the bar.

If there was cash we know what we make, walk with cash and can split those shared shift tabs evenly every night. Without cash it is entirely left up to the office to do all kinds of addittional calculations both from out checks and from the server tip outs. And then how do you keep track of that from our perspective. I really think they will not agree to do all of these additional calculation - and prob will simply just go with the easiest option of an entire tip share pool with everyone - servers, bartenders, FOH and BOH.

That is the easiest route for them. I'm trying to avoid the tip pool tip share option as much as possible but without a reasonable option that is easy for the office to manage, I don't think I have a shot. Luckily they are very open and interested in any tip protocols that I can recommend.

I just can't think of an easy and fair one in this situation.

BTW it's kind of a higher end sports beach type Vegas pool type vibe that will host 200-600 people throughout the day. It is also outdoors so the traffic can vary greatly depending on the season and weather conditions.

Anyone work in a similar situation and have thoughts on what works/doesn't work for you?